Deliverability

Delivery without middlemen

euromail is not a wrapper around SES, SendGrid, or Postfix. A purpose-built Rust MTA on the Tokio runtime delivers your mail straight to recipient servers.

Direct delivery

Your mail, straight to the MX

No third-party relay sits between euromail and the receiving server. Each domain gets its own 2048-bit RSA DKIM key at verification. Temporary failures retry with exponential backoff; permanent 5xx responses are classified as hard bounces immediately, and connection pools to frequently contacted servers keep latency down.

→ MAIL FROM:<[email protected]>
← 250 2.1.0 Ok
→ DATA  DKIM-Signature: pass
← 250 2.0.0 queued
  delivered in 1.2s

Standards

TLS enforced where the recipient asks

STARTTLS is attempted on every outbound connection. Where the recipient publishes an MTA-STS policy (RFC 8461), euromail fetches it, validates the MX patterns, and enforces TLS in enforce mode. Policies are cached up to their max_age. Owning the MTA means owning the retry, TLS, and bounce behavior end to end.

MTA: Purpose-built Rust, Tokio runtime
DKIM: 2048-bit RSA per domain
MTA-STS: RFC 8461, enforced
Retries: Exponential backoff on 4xx

Start sending free How delivery works