What to do
- Nothing to fix.
How it appears in a bounce
354 Start mail inputPaste the full bounce into the decoder — it finds every code and recipient and says what to check.
SMTP 354 Start mail input
After DATA: send the message and end it with a line containing a single dot.
354
- Class
- 3xx · Intermediate
- Retried?
- Not needed
- Defined in
- RFC 5321