Examine migration.log if it is not successful: tellmail imap_import oldimaphost olduser oldpass delete|keep create|nocreateĮ.g. You can also use this command line tool to import a single account or test importing an account. CRAM-MD5 is best not used as SSL offers better security. Note! migration cannot be used in conjunction with CRAM-MD5 as that prevents surgemail from storing the old password.
Whenever a user checks their mail an account with the same username and password will be created in SurgeMail and all outstanding mail will be retrieved. Change your DNS and MX records to point to surgemail. Test your migration by logging directly into the new surgemail server (specify the ip address of the server). 
The fallback_relay setting will pass on all mail for accounts that not yet have been created locally to your old server and the old_pophost setting will allow SurgeMail to retrieve account information and email from the old mailserver. All SurgeMail versions include: Mail, SSL, WebMail, unlimited Domains and our complete Anti-Spam system). Setup the options old_POPhost / old_IMAPhost and fallback_relay for the domain you are migrating (on domain administration page). SurgeMail provides a cost effective solution for systems of all sizes.
SURGEMAIL WIKIPEDIA INSTALL
Install SurgeMail onto your new server and configure to host your existing domains. Backup your existing mail server’s mailbox files 🙂. Mail delivered to SurgeMail for users that have not yet logged in will be forwarded on to your old mail server. From now on the user will use SurgeMail as their primary mailserver and mail for them will be delivered locally. If the account is valid SurgeMail will create an account and retrieve mail for this account storing it locally. When a user logs into SurgeMail and a local account does not exist, SurgeMail will login to the old server check the account is valid. This method configures SurgeMail to be the new mailserver for all users. This is a simple zero downtime method for migrating all active accounts from any arbitraty mailserver to SurgeMail. Migration using POP / IMAP intercept mode
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