Michelle Konzack writes:
Hello *,my lastest domain <tamay-dogan.net> is currently hostet virtualy on <server4.pinguin-hosting.de> and I am ongoing to switch to a VServer where I have full controll (I can install what I want). So can someone give me hints, HOW to migrate from postfix/dovecot to courier without lossin messages?
The first step is to verify that your new server's configuration is correct.The easiest way to do so is to use telnet to connect to your new server's port 25, and manually issue EHLO/MAIL FROM/RCPT TO/DATA commands to send a test message to your email address, then afterwards open the mailbox and make sure that the test message gets delivered. This will verify that your server is properly configured to receive mail for your email addresses and they get delivered where they should go.
Then, it's just a matter of updating your DNS MX record. There will be some transitional period, as DNS propagates throughout the Internet by which you'll be getting mail on both the old and the new server. When everyone has your new DNS record, your old server can be decomissioned.
As far as moving any mail from the old server to the new one, the easiest way to do so is just configure your IMAP client to access both your old and new mailboxes, then dragging/dropping your folders, one by one, from the old server to the new one.
Or, if you're feeling adventurous, rsyncing the mailboxes from the old server to the new one will work equally well, but make sure that you do not specify --delete, and end up removing new mail on the new server. Without it, messages from the old server will get added to the same folders on the new folders.
Make sure you just rsync the new/cur directories. Do not rsync the files in the parent folder -- do not touch courierimapuiddb, and other files there.
With this way, there will be a one-time annoyance of your mail that you migrated showing up, once, as new mail, when you open it in your mail client. That actually depends on your client, it may or may not do that.
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