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Postfix vs Axigen: What are the differences?
Developers describe Postfix as "A free and open-source mail transfer agent". It is a free and open-source mail transfer agent that routes and delivers electronic mail. It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support it. On the other hand, Axigen is detailed as "Mail server, calendaring & collaboration". It is a fully self developed solution, truly innovative in several respects, particularly scalable and configurable. This messaging solution offers the entire range of mail services — SMTP, POP3, IMAP, WebMail (Desktop and Mobile versions) — includes List server, Logging, Reporting, and FTP Backup modules and provides various, flexible administration options (including a central Web administration interface — WebAdmin).
Postfix and Axigen can be primarily classified as "Transactional Email" tools.