Enhanced SMTP status code · RFC 3463 · IANA
2.3.6 Requested priority was changed
A success code (RFC 6710): the message was accepted, but not at the priority requested.
- Class: Success
Class 2: delivery succeeded (RFC 3463 §3.1). This is a success or warning code, not an error.
- Subject: X.3 · Mail system
Something about the destination server; under its administrator's control.
Have the whole error message?
Sources: RFC 5321 · RFC 3463 · RFC 3464 · IANA · Gmail · Microsoft 365 · read on 26 September 2026