SMTP reply codes based on the SMTP commands

SMTP reply codes based on the SMTP commands


The following list groups the SMTP reply codes by the SMTP commands with which they can be associated. This can help you identify at what point the process failed.

HELO

250, 421, 500, 501, 504, 521

EHLO

250, 421, 500, 501, 504, 521

MAIL

250, 421, 451, 452, 500, 501, 552

RCPT

250, 251, 421, 450, 451, 452, 500, 501, 503, 521, 550, 551, 552, 553

DATA

354, 421, 451, 500, 501, 503, 554

SEND

250, 421, 451, 452, 500, 501, 502, 552

SOML

250, 421, 451, 452, 500, 501, 502, 552

SAML

250, 421, 451, 452, 500, 501, 502, 552

RSET

200, 250, 421, 500, 501, 504

VRFY

250, 251, 421, 500, 501, 502, 504, 550, 551, 553

EXPN

250, 421, 500, 501, 502, 504, 550

HELP

211, 214, 421, 500, 501, 502, 504

NOOP

200, 250, 421, 500

QUIT

221, 500

TURN

250, 500, 502, 503