Best Mail Server Software in 2026 · page 2
- 26
OpenSMTPD
Free planLinuxmacOSSelf-hosted5.9Free plan - 27
Mail-in-a-Box
WebAPILinuxSelf-hosted5.8 - 28
Haraka
Free planSelf-hosted5.7Free plan - 29
CommuniGate Pro
WebAPILinuxSelf-hosted5.6 - 30
Postfix
LinuxmacOSSelf-hosted5.6 - 31
Zentyal Server
Linux5.5 - 32
Open-Xchange App Suite
AndroidiOSWeb5.2 - 33
vSMTP
Linux4.5 - 344.3