My current mail server is a Fedora12 system running postfix/mysql/couriermail/squirrelmail mix.
My new server is a Centos6 running postfix/mysql/postfixadmin/dovecot/roundcube mix.
I have 4 virtual domains and about 20 users; not a big setup by any measure.
Both servers have the same host name, but are currently on separate subnets. My current plan is to stop services on the old server, switch them on subnets, rename the old server, and let 'slow users' drain the old server over a couple of days.
Then I got to thinking, could I migrate the /home/vmail/domain/user/new folders from the old to new server? Not too many rsync commands to run to pull it off, but would that work? Is there something dovecot needs to do, and not just drop the files into the .../new folder? Or is there some utility to run to properly place the mail files?
The file names are similar. Courier file names look like:
1362661301.Vfd01I2422e6M121970.klovia.htt-consult.com,S=17381
Whereas dovecot adds a ",W=nnn" string to the file name. I am assuming the content is otherwise the same.
I would like to test out the migration, and then pull it off over a sunday. Due to meetings and holidays, this won't happen until early April, so I have time to work out the details.
All guidance and pointers are greatly appreciated.