exim.ro

Basic SMTP reply code · RFC 5321

252 Cannot verify user, will accept

The server will not confirm the user (VRFY) but accepts the message and tries to deliver it.

Have the whole error message?

The whole bounce, a line like 550 5.7.26 … or the DSN fields (Status:, Diagnostic-Code:). At most 64 KB.

The text is read in memory only and not kept.

Sources: RFC 5321 · RFC 3463 · RFC 3464 · IANA · Gmail · Microsoft 365 · read on 26 September 2026