[HowTo] Replace courier with dovecot

[motokochan]

The first four lines are strict warnings. Not a bad thing, but the script should be updated and cleaned to fix those at some point.

The chdir error is probably because id 1001 isn't the vmail user on your system. Look at /etc/passwd and /etc/groups to find the numeric ids for vmail and mail. Once you have those, you want to edit those four sql conf files you created and replace "1001" and "8" with the ids you found.