{"id":7461,"date":"2026-10-12T13:04:06","date_gmt":"2026-10-12T11:04:06","guid":{"rendered":"https:\/\/eu.klytic.com\/spam-phishing-malware-kompromitovany-ucet\/"},"modified":"2026-10-12T16:14:15","modified_gmt":"2026-10-12T14:14:15","slug":"spam-phishing-malware-kompromitovany-ucet","status":"publish","type":"page","link":"https:\/\/eu.klytic.com\/cs\/spam-phishing-malware-kompromitovany-ucet\/","title":{"rendered":"Spam, phishing, malware a kompromitovan\u00fd \u00fa\u010det"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"7461\" class=\"elementor elementor-7461 elementor-6299\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-712e7da e-con-full kly-g e-flex e-con e-parent\" data-id=\"712e7da\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-bb6e2e0 e-con-full kly-g-hero e-flex e-con e-parent\" data-id=\"bb6e2e0\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-25210b7 e-con-full kly-g-hero-in e-flex e-con e-parent\" data-id=\"25210b7\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f0d2442 elementor-widget elementor-widget-text-editor\" data-id=\"f0d2442\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p class=\"kly-g-crumb\"><a href=\"\/\">Dom\u016f<\/a><span>\u203a<\/span>P\u0159\u00edru\u010dky<span>\u203a<\/span>Zabezpe\u010den\u00ed e-mail\u016f<\/p><p class=\"kly-g-pill\" style=\"--pill:#f87171\">Zabezpe\u010den\u00ed e-mail\u016f \u00b7 Pochopit<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4730749 elementor-widget elementor-widget-heading\" data-id=\"4730749\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Spam, phishing, malware a kompromitovan\u00fd \u00fa\u010det<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c7e516 elementor-widget elementor-widget-text-editor\" data-id=\"2c7e516\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p class=\"kly-g-lead\">\u010cty\u0159i r\u016fzn\u00e9 probl\u00e9my p\u0159ich\u00e1zej\u00ed stejn\u00fdmi dve\u0159mi. Spam se pozn\u00e1 podle objemu, phishing podle sv\u00e9 v\u011brohodnosti, malware podle p\u0159\u00edlohy nebo odkazu a kompromitovan\u00fd \u00fa\u010det p\u00ed\u0161e ze skute\u010dn\u00e9 schr\u00e1nky. Antispam zalo\u017een\u00fd na reputaci m\u00ed\u0159\u00ed hlavn\u011b na prvn\u00ed z nich: proto u\u017e nesta\u010d\u00ed a proto modern\u00ed filtr p\u0159ed rozhodnut\u00edm kombinuje v\u00edce sign\u00e1l\u016f.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-05bb16a elementor-widget elementor-widget-text-editor\" data-id=\"05bb16a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p class=\"kly-g-meta\"><span>Aktualizov\u00e1no: <b>\u0159\u00edjen 2026<\/b><\/span><span><b>6 min<\/b><\/span><span>Citovan\u00e9 ofici\u00e1ln\u00ed zdroje<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2a2ba21 e-con-full kly-g-body e-flex e-con e-parent\" data-id=\"2a2ba21\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-1de6084 e-con-full kly-g-article e-flex e-con e-parent\" data-id=\"1de6084\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8cda4ac elementor-widget elementor-widget-text-editor\" data-id=\"8cda4ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Spam: objem<\/h2>\n<p>Spam je nevy\u017e\u00e1dan\u00e1 po\u0161ta rozes\u00edlan\u00e1 hromadn\u011b. Obt\u011b\u017euje a stoj\u00ed \u010das, ale m\u00e1lokdy c\u00edl\u00ed na konkr\u00e9tn\u00ed ob\u011b\u0165.<\/p>\n<p>Co ho prozrad\u00ed: reputace serveru nebo dom\u00e9ny, kter\u00e1 ho odes\u00edl\u00e1, dom\u00e9na vytvo\u0159en\u00e1 p\u0159ed n\u011bkolika dny, reklamn\u00ed obsah opakovan\u00fd beze zm\u011bny u tis\u00edc\u016f p\u0159\u00edjemc\u016f. Filtr reputace a obsahu ho spolehliv\u011b zastav\u00ed a c\u00edlen\u00e9 pozdr\u017een\u00ed nezn\u00e1m\u00fdch odes\u00edlatel\u016f odfiltruje \u010d\u00e1st automatizovan\u00fdch z\u00e1silek.<\/p>\n<p>Je t\u0159eba odli\u0161it tzv. \u0161edou po\u0161tu. Newsletter, k jeho\u017e odb\u011bru se n\u011bkdo p\u0159ihl\u00e1sil, nebo ak\u010dn\u00ed nab\u00eddka zn\u00e1m\u00e9ho dodavatele nejsou spam. Jejich samostatn\u00e9 t\u0159\u00edd\u011bn\u00ed zabr\u00e1n\u00ed zahlcen\u00ed schr\u00e1nky, ani\u017e by se zablokovala o\u010dek\u00e1van\u00e1 zpr\u00e1va.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b32e444 elementor-widget elementor-widget-text-editor\" data-id=\"b32e444\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Phishing: v\u011brohodnost<\/h2>\n<p>N\u00e1rodn\u00ed syst\u00e9m pomoci ob\u011btem, cybermalveillance.gouv.fr, popisuje phishing jako fale\u0161nou zpr\u00e1vu, kter\u00e1 se vyd\u00e1v\u00e1 za d\u016fv\u011bryhodnou t\u0159et\u00ed stranu (banku, \u00fa\u0159ad, dodavatele, soci\u00e1ln\u00ed s\u00ed\u0165), aby odcizila p\u0159ihla\u0161ovac\u00ed \u00fadaje, hesla nebo bankovn\u00ed \u00fadaje. B\u011b\u017en\u00e9 podoby ve firm\u00e1ch:<\/p>\n<ul>\n<li>fale\u0161n\u00e1 p\u0159ihla\u0161ovac\u00ed str\u00e1nka do e-mailu nebo ke sd\u00edlen\u00ed soubor\u016f;<\/li>\n<li>napodoben\u00e1 zn\u00e1m\u00e1 zna\u010dka: p\u0159epravce, banka, v\u00fdrobce softwaru;<\/li>\n<li>QR k\u00f3d v obr\u00e1zku, kter\u00fd p\u0159esune odkaz z po\u010d\u00edta\u010de do telefonu;<\/li>\n<li>zpr\u00e1va vyz\u00fdvaj\u00edc\u00ed k zavol\u00e1n\u00ed na fale\u0161n\u00e9 \u010d\u00edslo podpory.<\/li>\n<\/ul>\n<p>Ov\u011b\u0159en\u00ed dom\u00e9ny zde nesta\u010d\u00ed. Podvodn\u00edk, kter\u00fd si koup\u00ed dom\u00e9nu podobnou t\u00e9 va\u0161\u00ed, m\u016f\u017ee pro tuto dom\u00e9nu dokonale nastavit SPF, DKIM i DMARC: jeho zpr\u00e1va je prav\u00e1\u2026 pro dom\u00e9nu, kter\u00e1 nen\u00ed va\u0161e. Prozrad\u00ed ho podobnost se zn\u00e1mou zna\u010dkou nebo dom\u00e9nou, st\u00e1\u0159\u00ed dom\u00e9ny, reputace odkaz\u016f a obsah.<\/p>\n<p>Kdy\u017e phishing c\u00edl\u00ed na konkr\u00e9tn\u00ed osobu, aby z\u00edskal p\u0159evod pen\u011bz, st\u00e1v\u00e1 se z n\u011bj podvod typu CEO fraud: viz <a href='\/cs\/podvod-ceo-fraud-zneuziti-identity\/'>zneu\u017eit\u00ed identity a podvod typu CEO fraud<\/a>. Co SPF, DKIM a DMARC skute\u010dn\u011b zastav\u00ed, podrobn\u011b popisuje pr\u016fvodce <a href='\/cs\/spf-dkim-dmarc-ochrana-domeny\/'>SPF, DKIM a DMARC<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43fbf95 elementor-widget elementor-widget-text-editor\" data-id=\"43fbf95\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Malware: p\u0159\u00edloha nebo odkaz<\/h2>\n<p>\u0160kodliv\u00fd program p\u0159ich\u00e1z\u00ed v p\u0159\u00edloze nebo za odkazem: dokument Office, kter\u00fd \u017e\u00e1d\u00e1 o povolen\u00ed maker, nebezpe\u010dn\u00e9 PDF, soubor HTML napodobuj\u00edc\u00ed p\u0159ihla\u0161ovac\u00ed str\u00e1nku, archiv, obr\u00e1zek s QR k\u00f3dem. Samotn\u00e1 zpr\u00e1va m\u016f\u017ee p\u016fsobit zcela oby\u010dejn\u011b (\u201eva\u0161e faktura\u201c, \u201esd\u00edlen\u00fd dokument\u201c).<\/p>\n<p>Odpov\u011b\u010f se t\u00fdk\u00e1 souboru a odkazu: antivirus, kontrola maker a PDF, \u010dten\u00ed QR k\u00f3d\u016f, reputace adres a pot\u00e9 ov\u011b\u0159en\u00ed v okam\u017eiku kliknut\u00ed. Pr\u016fvodce <a href='\/cs\/prilohy-odkazy-ransomware-e-mail\/'>p\u0159\u00edlohy, odkazy a ransomware<\/a> podrobn\u011b popisuje, co se kontroluje a co z\u016fst\u00e1v\u00e1 na \u010dlov\u011bku.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0188d1 elementor-widget elementor-widget-text-editor\" data-id=\"d0188d1\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Kompromitovan\u00fd \u00fa\u010det: skute\u010dn\u00e1 schr\u00e1nka<\/h2>\n<p>Zde zpr\u00e1va odch\u00e1z\u00ed ze skute\u010dn\u00e9 schr\u00e1nky, ze schr\u00e1nky dodavatele, z\u00e1kazn\u00edka nebo kolegy, jeho\u017e heslo bylo odcizeno. SPF projde, podpis DKIM je platn\u00fd, odes\u00edlatel je zn\u00e1m\u00fd. Filtr, kter\u00fd sleduje jen ot\u00e1zku \u201eJe odes\u00edlatel nezn\u00e1m\u00fd nebo \u0161patn\u011b ov\u011b\u0159en\u00fd?\u201c, nic neodhal\u00ed.<\/p>\n<p>Varovn\u00e9 sign\u00e1ly jsou v chov\u00e1n\u00ed:<\/p>\n<ul>\n<li>obvykl\u00fd korespondent n\u00e1hle p\u00ed\u0161e neobvykl\u00fdm p\u0159\u00edjemc\u016fm nebo velk\u00e9mu po\u010dtu p\u0159\u00edjemc\u016f;<\/li>\n<li>t\u00f3n, jazyk nebo \u010das odesl\u00e1n\u00ed, kter\u00e9 mu neodpov\u00eddaj\u00ed;<\/li>\n<li>nov\u00fd po\u017eadavek: zm\u011bna bankovn\u00edho spojen\u00ed, ne\u010dekan\u00fd odkaz ke sd\u00edlen\u00ed, dokument \u201ek okam\u017eit\u00e9mu podpisu\u201c;<\/li>\n<li>odpov\u011b\u010f vlo\u017een\u00e1 do star\u00e9 konverzace, aby vyu\u017eila jej\u00ed v\u011brohodnosti.<\/li>\n<\/ul>\n<p>Je t\u0159eba rozli\u0161it dv\u011b situace. Kdy\u017e v\u00e1m p\u00ed\u0161e \u00fa\u010det t\u0159et\u00ed strany, m\u016f\u017ee anom\u00e1lii odhalit filtr p\u0159\u00edchoz\u00ed po\u0161ty. Kdy\u017e jde o v\u00e1\u0161 vlastn\u00ed \u00fa\u010det, t\u00fdk\u00e1 se probl\u00e9m p\u0159edev\u0161\u00edm va\u0161eho e-mailov\u00e9ho syst\u00e9mu: heslo, dvoufaktorov\u00e9 ov\u011b\u0159en\u00ed, upozorn\u011bn\u00ed na p\u0159ihl\u00e1\u0161en\u00ed, pravidla p\u0159epos\u00edl\u00e1n\u00ed p\u0159idan\u00e1 \u00fato\u010dn\u00edkem. Nejde o stejn\u00fd projekt jako u vn\u011bj\u0161\u00edho phishingu, i kdy\u017e \u010dasto phishingem za\u010d\u00edn\u00e1.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f366134 elementor-widget elementor-widget-text-editor\" data-id=\"f366134\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>\u010cty\u0159i hrozby, \u010dty\u0159i odpov\u011bdi<\/h2>\n<div class=\"kly-table\"><table><thead><tr><th>Hrozba<\/th><th>Co ji prozrad\u00ed<\/th><th>Hlavn\u00ed odpov\u011b\u010f<\/th><th>Co nesta\u010d\u00ed<\/th><\/tr><\/thead><tbody>\n<tr><td>Spam<\/td><td>Objem, reputace, ned\u00e1vno vytvo\u0159en\u00e1 dom\u00e9na<\/td><td>Reputace a obsah, c\u00edlen\u00e9 pozdr\u017een\u00ed<\/td><td>Ru\u010dn\u00ed maz\u00e1n\u00ed<\/td><\/tr>\n<tr><td>Phishing<\/td><td>Napodoben\u00e1 zna\u010dka nebo dom\u00e9na, podez\u0159el\u00fd odkaz<\/td><td>Detekce zneu\u017eit\u00ed identity, anal\u00fdza odkaz\u016f a QR k\u00f3d\u016f<\/td><td>Samotn\u00e9 SPF, DKIM a DMARC<\/td><\/tr>\n<tr><td>Malware<\/td><td>P\u0159\u00edloha nebo odkaz<\/td><td>Anal\u00fdza soubor\u016f, ochrana p\u0159i kliknut\u00ed<\/td><td>Antispam zalo\u017een\u00fd na reputaci<\/td><\/tr>\n<tr><td>Kompromitovan\u00fd \u00fa\u010det<\/td><td>Zm\u011bna zvyklost\u00ed zn\u00e1m\u00e9ho odes\u00edlatele<\/td><td>Detekce anom\u00e1li\u00ed, pot\u00e9 zabezpe\u010den\u00ed \u00fa\u010dtu<\/td><td>\u010cern\u00e1 listina odes\u00edlatel\u016f<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>P\u0159\u00edklad pro ilustraci. Mal\u00e1 firma obdr\u017e\u00ed v jedno pond\u011bl\u00ed vlnu reklam na tisk\u00e1rny, fale\u0161n\u00e9 ozn\u00e1men\u00ed o doru\u010den\u00ed s QR k\u00f3dem, \u201efakturu\u201c ve form\u00e1tu HTML a zpr\u00e1vu od \u00fa\u010detn\u00edho st\u00e1l\u00e9ho z\u00e1kazn\u00edka, kter\u00e1 oznamuje nov\u00e9 bankovn\u00ed spojen\u00ed. Prvn\u00ed t\u0159i zpr\u00e1vy jsou \u00fakolem pro filtr. \u010ctvrt\u00e1 p\u0159ich\u00e1z\u00ed ze skute\u010dn\u00e9 schr\u00e1nky: filtr m\u016f\u017ee anom\u00e1lii ozna\u010dit, ale rozhodne telefon\u00e1t z\u00e1kazn\u00edkovi na ji\u017e zn\u00e1m\u00e9 \u010d\u00edslo.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0370154 elementor-widget elementor-widget-text-editor\" data-id=\"0370154\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Jak funguje modern\u00ed filtrov\u00e1n\u00ed<\/h2>\n<p>Modern\u00ed filtr se nerozhoduje podle jedin\u00e9ho krit\u00e9ria. Vypo\u010d\u00edt\u00e1 sk\u00f3re z n\u011bkolika sign\u00e1l\u016f:<\/p>\n<ul>\n<li>pravost odes\u00edlatele: SPF, DKIM, DMARC, reputace serveru a dom\u00e9ny, st\u00e1\u0159\u00ed dom\u00e9ny;<\/li>\n<li>zpr\u00e1va: odkazy, text, zn\u00e1m\u00e9 podvodn\u00e9 sc\u00e9n\u00e1\u0159e, podobnost se zna\u010dkou nebo intern\u00edm jm\u00e9nem;<\/li>\n<li>p\u0159\u00edlohy: antivirus, makra, PDF, obr\u00e1zky;<\/li>\n<li>kontext: stejn\u00e1 zpr\u00e1va odeslan\u00e1 mnoha p\u0159\u00edjemc\u016fm (kampa\u0148) nebo obvykl\u00fd odes\u00edlatel, kter\u00fd m\u011bn\u00ed chov\u00e1n\u00ed.<\/li>\n<\/ul>\n<p>Sk\u00f3re vede k odstup\u0148ovan\u00e9mu rozhodnut\u00ed: doru\u010dit, p\u0159esunout do karant\u00e9ny, odm\u00edtnout, nebo odlo\u017eit nezn\u00e1m\u00e9ho odes\u00edlatele. Karant\u00e9na je stejn\u011b d\u016fle\u017eit\u00e1 jako odm\u00edtnut\u00ed: legitimn\u00ed zpr\u00e1vu, kter\u00e1 byla omylem odlo\u017eena, mus\u00ed b\u00fdt mo\u017en\u00e9 naj\u00edt a uvolnit, viz <a href='\/cs\/karantena-falesne-poplachy\/'>Karant\u00e9na, fale\u0161n\u00e9 poplachy a hl\u00e1\u0161en\u00ed<\/a>.<\/p>\n<p>Hl\u00e1\u0161en\u00ed u\u017eivatel\u016f, \u201etoto je spam\u201c nebo \u201etoto je legitimn\u00ed\u201c, pak upravuj\u00ed reputaci odes\u00edlatel\u016f. Filtr, kter\u00fd se u\u010d\u00ed ze sv\u00fdch chyb, vytv\u00e1\u0159\u00ed m\u00e9n\u011b fale\u0161n\u00fdch poplach\u016f.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f9da815 elementor-widget elementor-widget-text-editor\" data-id=\"f9da815\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>\u010cast\u00e9 dotazy<\/h2>\n<h3>Pro\u010d i s dobr\u00fdm filtrem st\u00e1le p\u0159ich\u00e1z\u00ed spam?<\/h3>\n<p>Proto\u017ee filtr v\u017edy vyva\u017euje mezi p\u0159\u00edli\u0161n\u00fdm blokov\u00e1n\u00edm a propou\u0161t\u011bn\u00edm. Nastaven\u00ed, kter\u00e9 nepropust\u00ed nic, odlo\u017e\u00ed i o\u010dek\u00e1van\u00e9 zpr\u00e1vy.<\/p>\n<h3>Je zpr\u00e1va, kter\u00e1 projde kontrolou DMARC, bezpe\u010dn\u00e1?<\/h3>\n<p>Ne. Dokazuje, \u017ee zobrazen\u00e1 dom\u00e9na odesl\u00e1n\u00ed povolila, nikoli \u017ee je obsah poctiv\u00fd. Viz <a href='\/cs\/spf-dkim-dmarc-ochrana-domeny\/'>SPF, DKIM a DMARC<\/a>.<\/p>\n<h3>Co d\u011blat s podez\u0159elou zpr\u00e1vou, kter\u00e1 u\u017e dorazila?<\/h3>\n<p>Neklikat, neodpov\u00eddat a m\u00edsto smaz\u00e1n\u00ed ji nahl\u00e1sit spr\u00e1vci. Cybermalveillance.gouv.fr tak\u00e9 doporu\u010duje v p\u0159\u00edpad\u011b pochybnost\u00ed kontaktovat danou organizaci kan\u00e1lem, kter\u00fd zn\u00e1te.<\/p>\n<h3>\u00da\u010det kolegy odes\u00edl\u00e1 podivn\u00e9 zpr\u00e1vy: co d\u011blat?<\/h3>\n<p>Upozornit spr\u00e1vce e-mailov\u00e9ho syst\u00e9mu, kter\u00fd zm\u011bn\u00ed heslo a zkontroluje dvoufaktorov\u00e9 ov\u011b\u0159en\u00ed a pravidla p\u0159epos\u00edl\u00e1n\u00ed. Nejde o nastaven\u00ed filtru.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-984dcb9 kly-g-klytic elementor-widget elementor-widget-text-editor\" data-id=\"984dcb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Kde se nach\u00e1z\u00ed Klytic<\/h2>\n<p><a href='\/cs\/klytic-mta\/'>Klytic MTA<\/a> analyzuje ka\u017edou zpr\u00e1vu ve vrstv\u00e1ch, je\u0161t\u011b p\u0159ed schr\u00e1nkou, p\u0159ed jak\u00fdmkoli e-mailov\u00fdm syst\u00e9mem.<\/p>\n<ul>\n<li><strong>Pravost<\/strong> (Essential i Advanced): SPF, DKIM, DMARC v\u010detn\u011b p\u0159eposlan\u00fdch zpr\u00e1v, reputace server\u016f a dom\u00e9n, st\u00e1\u0159\u00ed dom\u00e9n, c\u00edlen\u00e9 pozdr\u017een\u00ed nezn\u00e1m\u00fdch odes\u00edlatel\u016f.<\/li>\n<li><strong>Zpr\u00e1va<\/strong> (Essential i Advanced): anti-phishing, zneu\u017eit\u00ed zna\u010dky, podobn\u00e9 dom\u00e9ny a zobrazovan\u00e1 jm\u00e9na, QR k\u00f3dy, detekce kampan\u00ed a neobvykl\u00e9ho chov\u00e1n\u00ed odes\u00edlatele, t\u0159\u00edd\u011bn\u00ed newsletter\u016f.<\/li>\n<li><strong>P\u0159\u00edlohy<\/strong> (Essential i Advanced): antivirus, makra Office, PDF; nebezpe\u010dn\u00e9 p\u0159\u00edlohy jsou odstran\u011bny s informa\u010dn\u00ed zpr\u00e1vou. Advanced p\u0159id\u00e1v\u00e1 nebezpe\u010dn\u00e9 soubory HTML a skryt\u00fd text v obr\u00e1zc\u00edch.<\/li>\n<li><strong>V okam\u017eiku kliknut\u00ed<\/strong> (Advanced): odkazy jsou znovu analyzov\u00e1ny, kdy\u017e na n\u011b u\u017eivatel klikne.<\/li>\n<li><strong>Finan\u010dn\u00ed podvody<\/strong> (Advanced): podvody typu CEO fraud, fale\u0161n\u00e9 faktury, fale\u0161n\u00e9 platby a dal\u0161\u00ed sc\u00e9n\u00e1\u0159e.<\/li>\n<\/ul>\n<p>Hl\u00e1\u0161en\u00ed u\u017eivatel\u016f nap\u00e1jej\u00ed sd\u00edlen\u00e9 u\u010den\u00ed nap\u0159\u00ed\u010d instancemi a zpr\u00e1vy s nejednozna\u010dn\u00fdm sk\u00f3re posuzuje model AI, v obou nab\u00eddk\u00e1ch. Co tento model dost\u00e1v\u00e1, vysv\u011btluje pr\u016fvodce <a href='\/cs\/ai-filtrovani-e-mailu-duvernost\/'>AI ve filtrov\u00e1n\u00ed e-mail\u016f<\/a>.<\/p>\n<p>Omezen\u00ed: Klytic MTA vid\u00ed po\u0161tu, kter\u00e1 j\u00edm proch\u00e1z\u00ed. Zabezpe\u010den\u00ed va\u0161ich vlastn\u00edch \u00fa\u010dt\u016f (hesla, dvoufaktorov\u00e9 ov\u011b\u0159en\u00ed, p\u0159ihl\u00e1\u0161en\u00ed) z\u016fst\u00e1v\u00e1 v\u011bc\u00ed va\u0161eho e-mailov\u00e9ho syst\u00e9mu.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8de84ac kly-g-sources elementor-widget elementor-widget-text-editor\" data-id=\"8de84ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Zdroje<\/h2><p>Ov\u011b\u0159eno v \u0159\u00edjnu 2026.<\/p><ul><li>Cybermalveillance.gouv.fr, \u201eQue faire en cas de phishing ou hame\u00e7onnage ?\u201c (Co d\u011blat v p\u0159\u00edpad\u011b phishingu): definice phishingu, vyd\u00e1v\u00e1n\u00ed se za d\u016fv\u011bryhodnou t\u0159et\u00ed stranu, kr\u00e1de\u017e p\u0159ihla\u0161ovac\u00edch a bankovn\u00edch \u00fadaj\u016f, rady k ov\u011b\u0159en\u00ed. <a href='https:\/\/www.cybermalveillance.gouv.fr\/tous-nos-contenus\/fiches-reflexes\/hameconnage-phishing' rel='noopener' target='_blank'>cybermalveillance.gouv.fr<\/a><\/li><li>RFC 7489, DMARC: mechanismus ne\u0159e\u0161\u00ed vizu\u00e1ln\u011b podobn\u00e9 dom\u00e9ny, zneu\u017eit\u00ed zobrazovan\u00e9ho jm\u00e9na ani anal\u00fdzu obsahu. <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc7489' rel='noopener' target='_blank'>rfc-editor.org<\/a><\/li><li>Klytic, str\u00e1nka Klytic MTA: vrstvy anal\u00fdzy a moduly nab\u00eddek Essential a Advanced, dopl\u0148ky, zp\u016fsoby nasazen\u00ed, spu\u0161t\u011bn\u00ed zm\u011bnou MX. <a href='https:\/\/www.klytic.com\/klytic-mta\/' rel='noopener' target='_blank'>klytic.com<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-91a727d e-con-full kly-g-aside e-flex e-con e-parent\" data-id=\"91a727d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7d61f0f elementor-widget elementor-widget-html\" data-id=\"7d61f0f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"html.default\">\n\t\t\t\t\t<nav class=\"kly-g-toc\" aria-label=\"Na t\u00e9to str\u00e1nce\"><p>Na t\u00e9to str\u00e1nce<\/p><ol><\/ol><\/nav>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab20f41 elementor-widget elementor-widget-text-editor\" data-id=\"ab20f41\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"kly-g-cta\"><h3>Zastavte to, co antispam nevid\u00ed<\/h3><p>Zku\u0161ebn\u00ed verze zdarma na 30 dn\u00ed, p\u0159ed va\u0161\u00edm st\u00e1vaj\u00edc\u00edm e-mailov\u00fdm syst\u00e9mem.<\/p><p><a class=\"kly-g-btn\" href=\"\/cs\/zkusebni-verze-zdarma-na-30-dni\/\">Vyzkou\u0161et Klytic MTA \u2192<\/a><\/p><p style=\"margin:0\"><a class=\"kly-g-btn ghost\" href=\"\/cs\/klytic-mta\/\">Zobrazit ob\u011b nab\u00eddky<\/a><\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d41b4d8 e-con-full kly-g-related e-flex e-con e-parent\" data-id=\"d41b4d8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0ca62a4 elementor-widget elementor-widget-text-editor\" data-id=\"0ca62a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>P\u0159e\u010dt\u011bte si tak\u00e9<\/h2><div class=\"kly-g-grid\"><a class=\"kly-g-card\" href=\"\/cs\/podvod-ceo-fraud-zneuziti-identity\/\" style=\"--cat:#dc2626\"><span class=\"c\">Pochopit \u00b7 Zabezpe\u010den\u00ed e-mail\u016f<\/span><span class=\"t\">Zneu\u017eit\u00ed identity a podvod typu CEO fraud<\/span><span class=\"q\">CEO fraud m\u00ed\u0159\u00ed na platbu, \u010dasto bez viru. \u010cty\u0159i formy zneu\u017eit\u00ed identity, co filtr odhal\u00ed a kontrola, kter\u00e1 z\u016fst\u00e1v\u00e1 na lidech.<\/span><span class=\"m\"><span>6 min \u010dten\u00ed<\/span><b>\u010c\u00edst \u2192<\/b><\/span><\/a><a class=\"kly-g-card\" href=\"\/cs\/spf-dkim-dmarc-ochrana-domeny\/\" style=\"--cat:#dc2626\"><span class=\"c\">Pochopit \u00b7 Zabezpe\u010den\u00ed e-mail\u016f<\/span><span class=\"t\">SPF, DKIM a DMARC: co chr\u00e1n\u00ed a co nechr\u00e1n\u00ed<\/span><span class=\"q\">SPF, DKIM a DMARC br\u00e1n\u00ed pou\u017eit\u00ed p\u0159esn\u011b va\u0161\u00ed dom\u00e9ny. Zpr\u00e1vu ne\u010dtou: co zastav\u00ed, co projde a jak je zav\u00e9st.<\/span><span class=\"m\"><span>6 min \u010dten\u00ed<\/span><b>\u010c\u00edst \u2192<\/b><\/span><\/a><a class=\"kly-g-card\" href=\"\/cs\/prilohy-odkazy-ransomware-e-mail\/\" style=\"--cat:#dc2626\"><span class=\"c\">Pochopit \u00b7 Zabezpe\u010den\u00ed e-mail\u016f<\/span><span class=\"t\">P\u0159\u00edlohy, odkazy a ransomware v e-mailu<\/span><span class=\"q\">Co filtr zkoum\u00e1 v p\u0159\u00edloze a v odkazu, pro\u010d ov\u011b\u0159ovat znovu p\u0159i kliknut\u00ed a co z\u016fst\u00e1v\u00e1 na \u010dlov\u011bku nebo na z\u00e1lohov\u00e1n\u00ed.<\/span><span class=\"m\"><span>6 min \u010dten\u00ed<\/span><b>\u010c\u00edst \u2192<\/b><\/span><\/a><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-539316dd e-con e-atomic-element e-div-block-base e-default-div e-c9fd865-4a50 \" data-id=\"539316dd\" data-element_type=\"e-div-block\" data-e-type=\"e-div-block\" data-interaction-id=\"539316dd\" data-e-type=\"e-div-block\" data-id=\"539316dd\">\n    <div class=\"elementor-element elementor-element-4f79afcb e-con e-atomic-element e-div-block-base e-default-div e-4fa9fe-ce86 \" data-id=\"4f79afcb\" data-element_type=\"e-div-block\" data-e-type=\"e-div-block\" data-interaction-id=\"4f79afcb\" data-e-type=\"e-div-block\" data-id=\"4f79afcb\">\n    \t\t\t<p class=\"e-4dcf5c70-2ec7 e-paragraph-base e-default-p\" data-interaction-id=\"330a7a35\" data-e-type=\"widget\" data-id=\"330a7a35\">Uv\u00edtac\u00ed nab\u00eddka<\/p>\n\t\t\t\t\t<h2 data-interaction-id=\"56f1f7d5\" class=\"e-347faa43-4e20 e-heading-base e-default-h2\" data-e-type=\"widget\" data-id=\"56f1f7d5\">30 dn\u00ed zku\u0161ebn\u00ed verze zdarma a migrace s asistenc\u00ed<\/h2>\n\t\t\t\t\t<p class=\"e-7f6310da-1caa e-paragraph-base e-default-p\" data-interaction-id=\"2ce27288\" data-e-type=\"widget\" data-id=\"2ce27288\">Zku\u0161ebn\u00ed nab\u00eddka bez z\u00e1vazk\u016f. N\u00e1\u0161 poradce v\u00e1m zavol\u00e1, aby poznal va\u0161e pot\u0159eby a p\u0159ipravil va\u0161e prost\u0159ed\u00ed Klytic.<\/p>\n\t\t<div class=\"elementor-element elementor-element-35ea29a1 e-con e-atomic-element e-div-block-base e-default-div e-1cd48b22-e6da \" data-id=\"35ea29a1\" data-element_type=\"e-div-block\" data-e-type=\"e-div-block\" data-interaction-id=\"35ea29a1\" data-e-type=\"e-div-block\" data-id=\"35ea29a1\">\n    \t\t\t<a href=\"\/essai-gratuit\/\" target=\"_self\" class=\"e-4a7886e3-652d e-button-base e-default-a\" data-interaction-id=\"19bfa8f1\" data-e-type=\"widget\" data-id=\"19bfa8f1\">\n\t\ud83d\ude80 Zah\u00e1jit zku\u0161ebn\u00ed verzi zdarma\n<\/a>\n\t\t\t\t\t<a href=\"\/tarifs\/\" target=\"_self\" class=\"e-137e863d-dd0d e-button-base e-default-a\" data-interaction-id=\"326d82ab\" data-e-type=\"widget\" data-id=\"326d82ab\">\n\tZobrazit cen\u00edk\n<\/a>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_seopress_titles_title":"Spam, phishing, malware, kompromitovan\u00fd \u00fa\u010det | Klytic","_seopress_titles_desc":"Spam, phishing, nebezpe\u010dn\u00e1 p\u0159\u00edloha, kompromitovan\u00fd \u00fa\u010det: \u010dty\u0159i e-mailov\u00e9 hrozby, \u010dty\u0159i odpov\u011bdi. Jak modern\u00ed filtr p\u0159i rozhodov\u00e1n\u00ed kombinuje sign\u00e1ly.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"Spam, phishing, malware, kompromitovan\u00fd \u00fa\u010det | Klytic","_seopress_social_fb_desc":"Spam, phishing, nebezpe\u010dn\u00e1 p\u0159\u00edloha, kompromitovan\u00fd \u00fa\u010det: \u010dty\u0159i e-mailov\u00e9 hrozby, \u010dty\u0159i odpov\u011bdi. Jak modern\u00ed filtr p\u0159i rozhodov\u00e1n\u00ed kombinuje sign\u00e1ly.","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"Spam, phishing, malware, kompromitovan\u00fd \u00fa\u010det | Klytic","_seopress_social_twitter_desc":"Spam, phishing, nebezpe\u010dn\u00e1 p\u0159\u00edloha, kompromitovan\u00fd \u00fa\u010det: \u010dty\u0159i e-mailov\u00e9 hrozby, \u010dty\u0159i odpov\u011bdi. Jak modern\u00ed filtr p\u0159i rozhodov\u00e1n\u00ed kombinuje sign\u00e1ly.","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"class_list":["post-7461","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/pages\/7461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/comments?post=7461"}],"version-history":[{"count":0,"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/pages\/7461\/revisions"}],"wp:attachment":[{"href":"https:\/\/eu.klytic.com\/cs\/wp-json\/wp\/v2\/media?parent=7461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}