I work as a consultant. My scripts' target environment can change on a very frequent basis, and I can never count on a particular OS, or service.

In this situation, I've found the most fruitful (if not most efficient) way to handle the mail issue is to use Net::Telnet to talk to my friendly local SMTP server. The advantage is that SMTP is a standard interface, and I don't have to worry about any local sendmail / Qmail / postfix / IIS strangeness....

update: Took a look at Mail::Sendmail this afternoon. It fulfills all my requirements and then some! I'll be throwing away my hand rolled code now :).