TOOLS THAT INTEGRATE WITH SMTP
Roundcube
OPEN SRCBrowser-based IMAP client with an application-like user interface
Uptime Kuma
FREEMIUMSelf-hosted monitoring tool for websites and services
Gogs
FREEMIUMSelf-hosted Git service that's lightweight and easy to install
SnappyMail
OPEN SRCSimple, modern, lightweight & fast web-based email client (fork of RainLoop)
Answer
OPEN SRCKnowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more
agentMBOX
PAIDAgent self-onboarding mailbox
Postal
FREEMIUMRobust, scalable email delivery for your applications
Docspell
OPEN SRCOrganize and find documents with automatic tagging.
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
Lume Free Email Tools
FREEMIUMFree SPF/DKIM checker, blacklist scanner & header analyzer
Cypht
OPEN SRCEmail feeds and web subscriptions in one unified inbox
Mailora
PAIDSend with confidence
Emit Emails
FREEMIUMGenerate thousands of personalized emails from one template
sMail
PAIDLoad a CSV. Write a message. Send to hundreds via Gmail.
Antville
OPEN SRCFree, open source project aimed at the development of a high performance, feature rich weblog hosting software
SquirrelMail
OPEN SRCA simple webmail client for reading email anywhere
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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.