Mailpit

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1. v1.31.42026-10-03Prevent duplicate messages from being added in websocket handlers (#737)
2. v1.31.32026-09-27Limit maximum MIME parts parsed per message to 500
3. v1.31.22026-09-19A vulnerability was fixed which allowed animated image attachments (APNG, GIF, WebP) to bypass the thumbnail pixel budg…
4. v1.31.12026-09-05This release adds an optional feature to mitigate DNS rebinding attacks (read more), as well as other hardening fixes.
5. v1.31.02026-08-22Add deep dark theme (#728)

• MailtrapThe email sandbox only, with SMTP capture, a web inbox, HTML checks and an API; no sending service.Partial
• MailHogSame default SMTP and web ports, with its own API and an actively maintained codebase.Full replacement