Would anyone consider have a dedicated machine just for email if it was absolutely critical to ensure that the mail was received and to be able to do root things like interrogate the mailq / log files?
Lots of people have dedicated mail servers and even multiple ones. It just depends on whether or not you actually need it, it's not like if you're sending 1 e-mail every 5 minutes you need a dedicated server for that. It's the people sending averages of 1 e-mail per second or something of the sort.
We rely totally on email for business and personal purposes. Finding, increasingly, that the many new viruses and increased anti-spam filtering does render messages not-delivered to the receipient.
We've seen alot of occasions in the last week where email hasn't been delivered to receipient for business and personal reasons, but no bounce has been received - meaning it would have been nice to have had access to the mailq / log files.