E

email

unsubd.dev — stateless Go service that executes newsletter unsubscribes on your behalf, bypassing DNS sinkholes

amavis is a high-performance email content filter framework written in Perl.

Declarative, idempotent mail server configuration script

Microsoft Social Login plugin for RosarioSIS. User login using Microsoft as an external identity provider (through the OAuth 2.0 protocol).

terminal e-mail client and e-mail client library https://meli-email.org

Preserve your emails for with this open-source self-hostable email archive!

SMTP (email) server with a focus on simplicity, security, and ease of operation [mirror]

spf is an open source implementation of the Sender Policy Framework (SPF) in Go.

It is used by the chasquid and maddy SMTP servers.

Multi-mailbox IMAP/SMTP control plane. One YAML, N accounts, one bearer-auth gate. Unified inbox across Gmail/Outlook/iCloud/mailo/inbox.lv/whatever — search, read, mark, send. Reader mode strips HTML chrome for LLMs. Streamable-HTTP MCP server + REST API on one port. Ships as a Docker image.

DMARC library and milter module implemented in Python.

A cross-platform, open-source GUI tool for syncing emails between email providers using the IMAP protocol. Mail Hermit runs locally on your computer and uses only your computer to securely transfer your emails from one provider to another.

Mail protocol for the small web https://misfin.gitlab.io/

Kotlin Service to send an email over SMTP

Zero-OAuth email-to-Telegram relay. Encrypted aliases, Ed25519-signed gRPC ingress, priority-queued MTProto delivery in under 2 seconds.

Simple and complete declarative NixOS Mailserver setups

EmailXpose is an open source AI-powered email security system that detects phishing, spam, scams, malware, and social engineering attacks. It goes beyond traditional email filters by combining natural language processing, behavioral analysis, and multi-modal intelligence to analyze text, images, and video content. The system also includes advanced features like sender trust scoring, attachment sandboxing, explainable risk reports, and symbolic/contextual interpretation of email content. Its goal is to provide transparent, privacy-first “AI-powered email clarity” so users can understand both threats and intent behind every message. https://roxanneardary.com/emailxpose/

Systemd failure notification framework using template units (@) and journal log harvesting piped to msmtp.

Tiny Go client for Postmark's SpamCheck API: submit a raw email, get its SpamAssassin spam score and matched-rule breakdown. No account or API key required.

Transform your e-mail newsletters into webpages and an RSS feed. Uses pico as a front end.

TLS-enabled mail retrieval (POP3/IMAP/ETRN/ODMR) and forwarding (SMTP/LMTP/MDA) agent.

Note the Git branches: legacy_6x (6.5.x release maintenance) and next (mid-term future 7.x.x development)