Originally posted by ppuru
Alternatives are -
postfix - MasterC's personal favorite
to name a few popular ones...
Wow, I guess I've made it pretty much well known eh
Yeah, I was gonna pop in here and say that, but it's been said, just to add a bit..
It's considered out of the box more secure than Sendmail, and is MUCH easier to understand/setup as well. The guide that comes with the source when setting it up is unparalleled to ANY I've found with other mail servers (truth be told I've not used many: sendmail, Qmail and a few others I've not even looked back at, not including exim which I've seen acid_kewpie recommend often and certainly has quite the documentation on it's site, excellent excellent job whoever put that together).
Worth a shot if you've got the time and resources to test it out anyway.