{"id":3294,"date":"2026-10-05T22:26:36","date_gmt":"2026-10-05T20:26:36","guid":{"rendered":"https:\/\/eu.klytic.com\/?page_id=3294"},"modified":"2026-10-06T17:21:31","modified_gmt":"2026-10-06T15:21:31","slug":"migrate-email-without-downtime","status":"publish","type":"page","link":"https:\/\/eu.klytic.com\/en\/migrate-email-without-downtime\/","title":{"rendered":"How do you migrate a business email service without downtime?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3294\" class=\"elementor elementor-3294 elementor-3219\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d22e878 e-con-full kly-g e-flex e-con e-parent\" data-id=\"d22e878\" 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-1ecdc48 e-con-full kly-g-hero e-flex e-con e-parent\" data-id=\"1ecdc48\" 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-8b9cb18 e-con-full kly-g-hero-in e-flex e-con e-parent\" data-id=\"8b9cb18\" 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-bb23922 elementor-widget elementor-widget-text-editor\" data-id=\"bb23922\" 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=\"\/en\/\">Home<\/a><span>\u203a<\/span><a href=\"\/en\/guides\/\">Guides<\/a><span>\u203a<\/span><a href=\"\/en\/guides\/#migration\">Migration<\/a><\/p><p class=\"kly-g-pill\" style=\"--pill:#2dd4bf\">Migration<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e5aa24 elementor-widget elementor-widget-heading\" data-id=\"3e5aa24\" 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\">How do you migrate a business email service without downtime?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c9c9cd elementor-widget elementor-widget-text-editor\" data-id=\"7c9c9cd\" 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\">A migration without downtime means that every message sent to your domain lands in a mailbox, and that every employee can write to their contacts on cutover day. It does not mean that the history, the mobile devices and people\u2019s habits change without anyone lifting a finger.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8e2b606 elementor-widget elementor-widget-text-editor\" data-id=\"8e2b606\" 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>Updated <b>October 2026<\/b><\/span><span><b>8 min<\/b> read<\/span><span>Official sources cited<\/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-7c41ff2 e-con-full kly-g-body e-flex e-con e-parent\" data-id=\"7c41ff2\" 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-eccc194 e-con-full kly-g-article e-flex e-con e-parent\" data-id=\"eccc194\" 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-374743a elementor-widget elementor-widget-text-editor\" data-id=\"374743a\" 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>The principle<\/h2><p>Two platforms run in parallel.<\/p><ul><li>The old one keeps receiving mail as long as the domain\u2019s MX points to it.<\/li><li>The new one receives a copy of the history, then a second copy of the delta.<\/li><li>On cutover day, the MX points to the new one. The old one remains readable long enough to check that no flow still uses it.<\/li><\/ul><p>The classic gap comes from an MX switched while a copy is incomplete, or from a copier, a website or a CRM that still sends with the old credentials.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ccccc7 elementor-widget elementor-widget-text-editor\" data-id=\"8ccccc7\" 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>Why mail is not lost, and when it is<\/h2><p>The MX is a DNS record: it tells sending servers where to deliver mail for your domain. Changing email services means, first of all, changing this delivery address. Everything else (accounts, history, devices) is prepared around it.<\/p><p>The SMTP protocol copes well with short incidents. A sending server that receives a temporary error keeps the message in its queue and retries later. A server that is briefly unreachable therefore does not cause mail to be lost. A permanent error (unknown mailbox, message refused), on the other hand, returns the message to its sender, and that message will never arrive on its own. The main risk of a cutover is not an outage; it is the new platform refusing a recipient because an alias or a list was not recreated.<\/p><p>The TTL (time to live) sets how long a DNS resolver may keep an answer in memory. During that period, some senders still deliver to the old platform. This is normal, and it is why the old platform must remain able to receive during the transition.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0e15508 elementor-widget elementor-widget-text-editor\" data-id=\"0e15508\" 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>The sequence<\/h2><p><strong>Two weeks before.<\/strong> Inventory of mailboxes, aliases, lists, shared mailboxes, and all the applications that send mail. Lowering of the MX DNS TTL to a short value (often 300 seconds), so that cutover day propagates quickly. Creation of the target accounts. First copy of the history.<\/p><p>The TTL is lowered early because a resolver that has read the old value keeps it until it expires: the short TTL only takes effect once the old cache has run out. The first copy, for its part, is the longest; starting it early leaves time to discover the problem mailboxes.<\/p><p><strong>A few days before.<\/strong> Check of a sample: number of messages, folders or labels, appointments, contacts. Correction of the method if the sample fails. Preparation of the mobile and Outlook instructions. Test send from the target to Gmail and Outlook.com, with SPF, DKIM and DMARC already valid on the new platform. These records can be published before the MX.<\/p><p>In practice: a single SPF record that authorises both platforms during the transition (two separate SPF records cause the check to fail), a DKIM key for the new platform published under its own selector, alongside the old one, and a reviewed DMARC policy. DMARC requires the message to be authenticated by SPF or by DKIM on behalf of the sender\u2019s domain; if your policy is strict and the target is not yet authorised, your contacts reject your messages.<\/p><p><strong>The day before.<\/strong> Second pass: copy only what has arrived since the first copy. Freeze changes to aliases and lists.<\/p><p><strong>Cutover day.<\/strong> Switch of the MX. Immediate external check: an email sent from an outside personal mailbox must arrive on the new platform within the TTL. Monitoring of the queue. Reconfiguration of the sending applications. An identified internal hotline, with the authority to roll the MX back if a critical flow fails.<\/p><p>Change the autodiscover record at the same time if there is one: it is what Outlook queries to find its server. Also remove any secondary MX records that would still point to the old platform: a sender that cannot reach the primary MX tries the next ones.<\/p><p><strong>The following days.<\/strong> The old platform in read-only mode. Reporting of discrepancies (a missing folder, a shared mailbox). A targeted third pass if needed. Then sending is shut off on the old platform, so that no employee replies from two places any more.<\/p><p>This last point has a technical reason. The old platform still considers itself responsible for your domain: a message sent from it to a colleague is delivered locally there, without consulting the MX. The colleague will never see it in their new mailbox.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9b8d655 elementor-widget elementor-widget-text-editor\" data-id=\"9b8d655\" 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>The risks, and how to avoid them<\/h2><div class='kly-table'><table><thead><tr><th>Risk<\/th><th>What happens<\/th><th>Countermeasure<\/th><\/tr><\/thead><tbody><tr><td>MX switched too early<\/td><td>New mail arrives, the history is missing<\/td><td>Switch after checking the sample and running the second pass<\/td><\/tr><tr><td>Forgotten alias or list<\/td><td>The target permanently refuses these messages<\/td><td>Inventory, alias freeze the day before, test of shared addresses<\/td><\/tr><tr><td>Incomplete SPF, DKIM or DMARC<\/td><td>Your messages are rejected or marked as spam by your contacts<\/td><td>Publish before cutover day, check on a real message<\/td><\/tr><tr><td>Application sending with the old account<\/td><td>Invoices, alerts or scans no longer go out<\/td><td>List of applications, new SMTP server configured on cutover day<\/td><\/tr><tr><td>Sending left open on the old platform<\/td><td>Internal messages stay in the old system<\/td><td>Shut off sending as soon as the sample is validated<\/td><\/tr><tr><td>Rollback not prepared<\/td><td>The MX is rolled back, but the messages received in the meantime remain on the target<\/td><td>Written plan, including the recovery of these messages<\/td><\/tr><\/tbody><\/table><\/div><h3>Example<\/h3><p>Take, by way of illustration, a 40-person firm. It chooses to switch on a Thursday at the end of the day rather than on a Friday: the next day, the team is present to deal with discrepancies, and the internal hotline has a full working day ahead of it. The reception copier, which scans to email, is reconfigured that same evening. If two shared mailboxes report a missing folder, a targeted pass fills the gap. In this scenario, no message is lost, but several employees have to set up their account again on their phone: that is the visible part that must be announced.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6ecad35 elementor-widget elementor-widget-text-editor\" data-id=\"6ecad35\" 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>What remains visible to employees<\/h2><p>They change server in Outlook or on their mobile. The first load of a large mailbox takes time. Messages already cached on the phone may be duplicated if the profile is not recreated cleanly. Plan for the \u201cdelete the account and recreate it\u201d procedure rather than patching the server settings.<\/p><p>The reason is the same for Outlook: the profile keeps a local cache tied to the old server. A new profile starts from a clean state; a modified old profile mixes the two worlds. On mobile, the protocol used (Exchange ActiveSync or IMAP depending on the target) sometimes changes with the platform, which is one more reason to recreate the account.<\/p><p>Server-side rules, centralised signatures and delegation rights have to be set up again. Announce it. This is not an interruption of mail. It is administration work.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9467987 elementor-widget elementor-widget-text-editor\" data-id=\"9467987\" 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>What no method makes invisible<\/h2><ul><li>The history of a proprietary instant messaging tool.<\/li><li>An email already rejected by the old platform before the cutover.<\/li><li>A contact who has cached your old key or a local rule.<\/li><li>DNS propagation at a resolver that ignores the TTL. It is rare, and it justifies keeping the old platform able to receive for a few more days, with forwarding to the new one, if your architecture allows it.<\/li><\/ul><p>This forwarding requires an explicit setting: the old platform, which still believes it hosts the mailboxes, must be configured to relay to the new one instead of delivering locally. Failing that, a targeted catch-up pass does the same job.<\/p><p>The specifics of each starting point are described in <a href='\/en\/migrate-from-microsoft-365\/'>migrating from Microsoft 365<\/a> and <a href='\/en\/migrate-from-google-workspace\/'>migrating from Google Workspace<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2887c6e elementor-widget elementor-widget-text-editor\" data-id=\"2887c6e\" 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>Frequently asked questions<\/h2><h3>How long should the two platforms coexist?<\/h3><p>Long enough to check that no flow still uses the old one, and that the reported discrepancies have been dealt with. This depends on the number of mailboxes, the applications that send mail and the pace at which workstations are reconfigured. Closing too early prevents corrections; closing too late leaves employees working in two systems.<\/p><h3>Does changing the MX cut off mail for a few hours?<\/h3><p>No, if it is prepared. During the TTL period, some senders still deliver to the old platform, others to the new one. Both receive, and the next pass brings the two together. Mail is only lost if it is refused, hence the importance of aliases and lists.<\/p><h3>Should we notify our contacts?<\/h3><p>Generally not: the addresses do not change. Do, however, notify partners who strictly filter your messages or who have assigned you a specific rule, and those who exchange encrypted mail with you, if the keys change.<\/p><h3>Can we roll back after the cutover?<\/h3><p>Yes, by restoring the old MX, provided the old platform is still active. The messages received by the new one in the meantime must then be copied back or remain accessible. The rollback plan states who decides, how quickly, and how these messages are recovered.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e4c6852 elementor-widget elementor-widget-text-editor\" data-id=\"e4c6852\" 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>The guarantee that matters<\/h2><p>Ask the operator what it guarantees: the arrival of messages, the transfer of the history, or both. These are different commitments. Also ask for the rollback plan, in writing, with the person who has the authority to activate it.<\/p><p>A guarantee on the arrival of messages covers cutover day and the following days. A guarantee on the history covers the copy and its verification. A provider can honour one without the other; the quote must state which one it takes on and how it is verified.<\/p><p>At Klytic, advice and suggestions for preparing the email migration are free, and no email is lost. A migration carried out by Klytic is priced on a quote basis. Subscriptions are on the <a href='\/en\/pricing\/'>Pricing<\/a> page and are invoiced separately. The breakdown of cost items is in <a href='\/en\/microsoft-365-migration-cost\/'>how much a Microsoft 365 migration costs<\/a>, and the control list in the <a href='\/en\/microsoft-365-migration-checklist\/'>checklist<\/a>. To compare targets, see <a href='\/en\/european-business-email\/'>choosing a European email service<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-76b844c kly-g-disclaimer elementor-widget elementor-widget-text-editor\" data-id=\"76b844c\" 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>This page describes a method. The actual process depends on your flows, your volumes and the platform you are leaving.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-778a5b6 kly-g-sources elementor-widget elementor-widget-text-editor\" data-id=\"778a5b6\" 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>Sources<\/h2><p>Accessed in October 2026.<\/p><ul><li>Migration commitment published by Klytic. <a href='\/en\/pricing\/'>Pricing page<\/a><\/li><li>The MX designates the servers that receive mail for a domain. <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc5321' rel='noopener' target='_blank'>RFC 5321, SMTP<\/a><\/li><li>Time to live of DNS records (TTL). <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc1035' rel='noopener' target='_blank'>RFC 1035<\/a><\/li><li>SPF, DKIM, DMARC: <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc7208' rel='noopener' target='_blank'>RFC 7208<\/a>, <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc6376' rel='noopener' target='_blank'>RFC 6376<\/a>, <a href='https:\/\/www.rfc-editor.org\/rfc\/rfc7489' rel='noopener' target='_blank'>RFC 7489<\/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-d210d6c e-con-full kly-g-aside e-flex e-con e-parent\" data-id=\"d210d6c\" 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-aa04b20 elementor-widget elementor-widget-html\" data-id=\"aa04b20\" 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=\"Contents\"><p>On this page<\/p><ol><\/ol><\/nav>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-17b07e4 elementor-widget elementor-widget-text-editor\" data-id=\"17b07e4\" 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>Prepare your email migration<\/h3><p>Free advice, no email lost. A migration carried out by Klytic is quoted after an inventory.<\/p><p><a class=\"kly-g-btn\" href=\"\/en\/quote-request\/\">Request a quote \u2192<\/a><\/p><p style=\"margin:0\"><a class=\"kly-g-btn ghost\" href=\"\/en\/pricing\/\">See pricing<\/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-7e42ddc e-con-full kly-g-related e-flex e-con e-parent\" data-id=\"7e42ddc\" 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-cd8d91f elementor-widget elementor-widget-text-editor\" data-id=\"cd8d91f\" 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>Read next<\/h2><div class=\"kly-g-grid\"><a class=\"kly-g-card\" href=\"\/en\/microsoft-365-migration-cost\/\" style=\"--cat:#0e7490\"><span class=\"c\">Migration<\/span><span class=\"t\">How much does a Microsoft 365 migration cost?<\/span><span class=\"q\">No serious price without an inventory. The quote\u2019s line items, what makes it vary, how to compare two offers and the internal costs people forget.<\/span><span class=\"m\"><span>9 min read<\/span><b>Read \u2192<\/b><\/span><\/a><a class=\"kly-g-card\" href=\"\/en\/microsoft-365-migration-checklist\/\" style=\"--cat:#0e7490\"><span class=\"c\">Migration<\/span><span class=\"t\">Microsoft 365 migration checklist<\/span><span class=\"q\">Checklist for before, during and after the cutover: inventory, quote, DNS, copy, mobiles, sending applications, rollback and tenant closure.<\/span><span class=\"m\"><span>5 min read<\/span><b>Read \u2192<\/b><\/span><\/a><a class=\"kly-g-card\" href=\"\/en\/protect-business-cloud-act\/\" style=\"--cat:#0077cc\"><span class=\"c\">Sovereignty<\/span><span class=\"t\">How can a business protect itself from the CLOUD Act?<\/span><span class=\"q\">The CLOUD Act targets the provider subject to US law, not the country of the disk. Operator, subcontractors, keys, support: the measures that matter.<\/span><span class=\"m\"><span>11 min read<\/span><b>Read \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\">Welcome offer<\/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-day free trial, assisted migration<\/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\">No-commitment trial offer. An advisor will call you back to understand your needs and prepare your Klytic space.<\/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=\"https:\/\/eu.klytic.com\/en\/30-day-free-trial\/\" 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 Start free trial\n<\/a>\n\t\t\t\t\t<a href=\"https:\/\/eu.klytic.com\/en\/pricing\/\" target=\"_self\" class=\"e-137e863d-dd0d e-button-base e-default-a\" data-interaction-id=\"326d82ab\" data-e-type=\"widget\" data-id=\"326d82ab\">\n\tSee pricing\n<\/a>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Accueil\u203aGuides\u203aMigration Migration Comment migrer une messagerie professionnelle sans interruption ? Une migration sans interruption signifie que chaque message envoy\u00e9 \u00e0 votre domaine arrive dans une bo\u00eete, et que chaque salari\u00e9 peut \u00e9crire \u00e0 ses correspondants le jour de la bascule. Elle ne signifie pas que l\u2019historique, les mobiles et les habitudes changent sans aucun geste. [&hellip;]<\/p>\n","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":"How do you migrate a business email service without downtime? | Klytic","_seopress_titles_desc":"Coexistence, second pass, MX TTL, SPF, DKIM, DMARC and test sends: switching email services without losing mail, and what remains visible.","_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":"How do you migrate a business email service without downtime? | Klytic","_seopress_social_fb_desc":"Coexistence, second pass, MX TTL, SPF, DKIM, DMARC and test sends: switching email services without losing mail, and what remains visible.","_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":"How do you migrate a business email service without downtime? | Klytic","_seopress_social_twitter_desc":"Coexistence, second pass, MX TTL, SPF, DKIM, DMARC and test sends: switching email services without losing mail, and what remains visible.","_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-3294","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/pages\/3294","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/comments?post=3294"}],"version-history":[{"count":2,"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/pages\/3294\/revisions"}],"predecessor-version":[{"id":3388,"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/pages\/3294\/revisions\/3388"}],"wp:attachment":[{"href":"https:\/\/eu.klytic.com\/en\/wp-json\/wp\/v2\/media?parent=3294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}