Dovecot
last commit a day ago, Other License
Dovecot mail server
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890 commits past year
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Stalwart JMAP
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Stalwart JMAP server
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Cyrus IMAP
last commit 3 days ago, Other License
Cyrus IMAP is an email, contacts and calendar server
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MailForm
last commit 9 months ago, Apache License 2.0
The lightweight self-hosted email service for contact forms and more!
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4 commits past year
Piler
Feature-rich open source email archiving solution.