syncimap.sh

#!/bin/bash
# Simple sync mails using Imapsync
# Authors:
# Jesus Lara <jesuslara@phenobarbital.info>
# version: 2.0
# Copyright (C) 2010 Jesus Lara

oldserver=10.0.0.10
newserver=10.0.0.11
while read p; do
    user=( $p )
    uid=${p%@*}
    pass=${user[1]}
    echo "Migrating mail from user ${uid}"
    /usr/bin/imapsync --authmech1 LOGIN --host1 $oldserver --authmech2 LOGIN --host2 $newserver --user1 $uid --password1 $pass --user2 $uid --password2 $pass --
syncinternaldates --allowsizemismatch --subscribe_all
    if [ $? -eq 0 ]; then
        echo "migration sucessful: ${uid}"
    else
      echo "ERROR in ${uid}"
      echo "${uid} >>error_mbox.log"
    fi 
done<migrate_mail.txt

echo "Migration Complete."
exit 0

"migrate_mail.txt" is a list of users, in a "user pass" format, one line per user.