Stalwart Labs
Modernize your mail server.
- Open Source
- Free
Best Stalwart Labs Alternatives & Competitors in 2025
The best Stalwart Labs alternatives based on verified products, community votes, reviews and other factors.
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E-mail Hosting for Your Domains
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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.
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Cheap, no-nonsense email.
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Mailu is a simple yet full-featured mail server as a set of Docker images.
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Platform to host multiple email domains.
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mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.
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Email, calendars, and contacts to highest standards of security, privacy and reliability.
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Apache James is a pure Java SMTP, POP3 enterprise mail server.
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A pure Unix shell script implementing ACME client protocol and deploying SSL certificates.
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Secure email with absolutely no compromises. Get your free encrypted email account today.
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immich Self-hosted photo and video backup solution directly from your mobile phone
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With Nextcloud enterprises host their own secure cloud solution for storage, collaboration & communication from any device, anywhere.
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Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
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