RustMailer
A self-hosted IMAP/SMTP middleware designed for developers
RustMailer launched on August 20, 2025 with 4 votes. The site was still online in September 2026, 1 year on.
What it does
RustMailer is a self-hosted, open-source email API platform for syncing IMAP, sending SMTP, and integrating via webhooks. It supports multi-account sync, programmable filters with VRL, NATS delivery, gRPC & OpenAPI, plus a built-in web client.
Connect to IMAP , Gmail API , and Graph API through one unified REST and gRPC interface. Self-hosted, event-driven, and open source. Stop wrestling with email protocols and webhooks. Let RustMailer handle the plumbing. After struggling with other unified email middleware layer services — both paid and open-source — we were frustrated with scalability, forced sales calls, and deceptive pricing. RustMailer was a breath of fresh air. While we initially hesitated to choose a relatively new middleware solution, we quickly discovered it met our requirements better than any established alternative. The support has been outstanding. The team doesn't just respond to requests — they actively…from rustmailer.com
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