Ok, I am looking for a smtp server to send out a ton of mail. We host about 250 companies email and need something simple that will a) check a database or control file and b)send preformatted email from a database source once that control file or db flag is found. Nothing mind boggling but I can't seem to find something that simple. I though i would try a ping here first before contracting this out to a development house to have it built.
I use qmail on linux which seems to be very robust and free. It's a bit of a pain to get it set up but once you do it is very stable. Qmail gives you very granular control of the mail processes, and you should be able to script mails off a database without any problem.