I'd also choose Cyrus, though I use sendmail & milter modules for
filtering, in preference to amavisd-new. MTA is a personal choice really -
whatever you're happiest with should be fine.
Indeed - Thunderbird/Mozilla are better clients if switching is an option.
I would avoid tar for backups if you go with Cyrus. Cyrus implements a
single instance store using filesystem hard links. Tar is potentially less
than optimal for dealing with lots of hard links (have a look at
I'd suggest dump or cpio. Personally I use dump (xfsdump in fact), but
some filesystems dump more reliably than others.
Use a webmail program that uses IMAP. Mixing protocols will confuse users.
I chose XFS, choice strongly influenced by backup tools which guarantee
consistent backups even on mounted filesystems (xfsdump/xfsrestore).
My preference is Amanda, which does a lot more for you than a simple cron
job. Amanda also makes efforts to "stream" the tape drive, which will
lessen wear and tear on drive and tapes.
Definitely a good move.
My 2p worth,