We are using qmail with ezmlm and while probably outdated now, this has been rock solid for years. When starting a new SMTP server I use postfix. Keep in mind t

We are using qmail with ezmlm and while probably outdated now, this has been rock solid for years. When starting a new SMTP server I use postfix. Keep in mind that sending out newsletters from a new IP needs a lot of extra effort to keep the IP off blacklists and the mails out of the spam filters.