Simple Mail Transfer Protocol Template loop detected: Template:Stub Related:
SMTP reply codes[edit]
Reply codes in numerical order
Code Meaning 200 (nonstandard success response, see rfc876) 211 System status, or system help reply 214 Help message 220 <domain> Service ready 221 <domain> Service closing transmission channel 250 Requested mail action okay, completed 251 User not local; will forward to <forward-path> 354 Start mail input; end with <CRLF>.<CRLF> 421 <domain> Service not available, closing transmission channel 450 Requested mail action not taken: mailbox unavailable 451 Requested action aborted: local error in processing 452 Requested action not taken: insufficient system storage 500 Syntax error, command unrecognised 501 Syntax error in parameters or arguments 502 Command not implemented 503 Bad sequence of commands 504 Command parameter not implemented 521 <domain> does not accept mail (see rfc1846) 530 Access denied (???a Sendmailism) 535 SMTP Authentication unsuccessful/Bad username or password 550 Requested action not taken: mailbox unavailable 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded storage allocation 553 Requested action not taken: mailbox name not allowed 554 Transaction failed