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@nguthiru nguthiru commented Feb 2, 2026

Add NoAuth adapter to disable AUTH advertisement in EHLO, enabling proper MX server configurations.

Motivation

SMTP servers typically operate in two distinct modes:

MSA (Mail Submission Agent) - Port 587

  • Accepts mail from authenticated users (MUAs like Thunderbird, Outlook)
  • Requires AUTH to prevent abuse
  • Users must authenticate before sending

MTA- Port 25

  • Accepts inbound mail from other MTAs on the internet
  • Should NOT advertise AUTH - remote MTAs don't authenticate
  • Relies on other controls: SPF, DKIM, IP reputation, rate limiting

@amiramix amiramix merged commit cd0f258 into master Feb 2, 2026
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3 participants