TOOLS THAT INTEGRATE WITH SMTP
Docspell
OPEN SRCOrganize and find documents with automatic tagging.
Cypht
OPEN SRCEmail feeds and web subscriptions in one unified inbox
Roundcube
OPEN SRCBrowser-based IMAP client with an application-like user interface
SnappyMail
OPEN SRCSimple, modern, lightweight & fast web-based email client (fork of RainLoop)
Mox
OPEN SRCComplete e-mail solution with IMAP4, SMTP, SPF, DKIM, DMARC, MTA-STS, DANE and DNSSEC, reputation-based and content-based junk filtering, Internationalization (IDNA), automatic TLS with ACME and Let's Encrypt, account autoconfiguration, and webmail
SquirrelMail
OPEN SRCA simple webmail client for reading email anywhere
Gogs
FREEMIUMSelf-hosted Git service that's lightweight and easy to install
Antville
OPEN SRCFree, open source project aimed at the development of a high performance, feature rich weblog hosting software
Postal
FREEMIUMRobust, scalable email delivery for your applications
Uptime Kuma
FREEMIUMSelf-hosted monitoring tool for websites and services
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WHY SMTP INTEGRATION MATTERS
Tools that integrate with SMTP let you connect your existing workflow without switching contexts. Whether you use SMTP for communication, development, or automation, these tools plug directly into your stack — saving time and reducing friction.