Enhanced SMTP status code · RFC 3463 · IANA
2.6.4 Conversion with loss performed
A warning: the message was delivered, but some content was lost in conversion.
- Class: Success
Class 2: delivery succeeded (RFC 3463 §3.1). This is a success or warning code, not an error.
- Subject: X.6 · Content
Problems with the message content (types, conversions); up to both sender and recipient.
- Associated basic codes (IANA registry)
Have the whole error message?
Sources: RFC 5321 · RFC 3463 · RFC 3464 · IANA · Gmail · Microsoft 365 · read on 26 September 2026