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SMTP Error 554 5.7.1: Relay access denied

Error✕ Not retryable · fix the payloadNetwork

TL;DR · 10-second read

Postfix refused to relay to an external domain because the client did not authenticate. Connect on 587 with STARTTLS and SMTP AUTH, or add the client network to mynetworks.

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What you see · exact log / response

554 5.7.1 <user@other-domain.com>: Relay access denied

Fix

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Copy-paste fixes for 554 5.7.1 are in the enrichment queue

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Last verified 2026-10-14 · Source: RFC 5321 reply codes + RFC 3463 enhanced status codes (IANA registry) · Official docs ↗ · ~6,600 searches/mo