email servers

Hello Everyone: I have a quick question. I am currently using SuSe 7.3 and sendmail for my email server. I have configured sendmail and been using it just fine. But I was wondering if maybe there is other viable email servers out there to replace sendmail. I would love to hear your recommendations on other alternatives and why. Bob -- 11:30am up 7 days, 4:51, 1 user, load average: 0.06, 0.04, 0.00