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Stalwart Mail Server
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IceWarp
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Axigen
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Microsoft Exchange Online
AndroidiOSWebmacOS6.9From $4 a year ($0.33 a month) - 8
Modoboa
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Kolab
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poste.io
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Kerio Connect
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Citadel
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Courier Mail Server
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Zimbra Collaboration
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iRedMail
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MDaemon Messaging Server
AndroidiOSWebSelf-hosted6.2 - 17
Exim
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HCL Domino
AndroidiOSWebAPI6.1 - 19
Mailu
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qmail
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hMailServer
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Apache James
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OpenSMTPD
Free planLinuxmacOSSelf-hosted5.9Free plan - 24
Cyrus IMAP
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