SMTP reply codes

See rfc1893 and rfc2034 for information about enhanced status codes.

Check the RFC index for further mail-related RFCs.

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)
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
Reply codes grouped by command Command Code Description
connect
  220 <domain> Service ready
  421 <domain> Service not available, closing transmission channel
HELO
  250 Requested mail action okay, completed
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  504 Command parameter not implemented
  521 <domain> does not accept mail [rfc1846]
  421 <domain> Service not available, closing transmission channel
EHLO
  250 Requested mail action okay, completed
  550 Not implemented
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  504 Command parameter not implemented
  421 <domain> Service not available, closing transmission channel
MAIL
  250 Requested mail action okay, completed
  552 Requested mail action aborted: exceeded storage allocation
  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
  421 <domain> Service not available, closing transmission channel
RCPT
  250 Requested mail action okay, completed
  251 User not local; will forward to <forward-path>
  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
  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
  503 Bad sequence of commands
  521 <domain> does not accept mail [rfc1846]
  421 <domain> Service not available, closing transmission channel
DATA
  354 Start mail input; end with <CRLF>.<CRLF>
  451 Requested action aborted: local error in processing
  554 Transaction failed
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  503 Bad sequence of commands
  421 <domain> Service not available, closing transmission channel
received data
  250 Requested mail action okay, completed
  552 Requested mail action aborted: exceeded storage allocation
  554 Transaction failed
  451 Requested action aborted: local error in processing
  452 Requested action not taken: insufficient system storage
RSET
  200 (nonstandard success response, see rfc876)
  250 Requested mail action okay, completed
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  504 Command parameter not implemented
  421 <domain> Service not available, closing transmission channel
SEND
  250 Requested mail action okay, completed
  552 Requested mail action aborted: exceeded storage allocation
  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
  421 <domain> Service not available, closing transmission channel
SOML
  250 Requested mail action okay, completed
  552 Requested mail action aborted: exceeded storage allocation
  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
  421 <domain> Service not available, closing transmission channel
SAML
  250 Requested mail action okay, completed
  552 Requested mail action aborted: exceeded storage allocation
  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
  421 <domain> Service not available, closing transmission channel
VRFY
  250 Requested mail action okay, completed
  251 User not local; will forward to <forward-path>
  550 Requested action not taken: mailbox unavailable
  551 User not local; please try <forward-path>
  553 Requested action not taken: mailbox name not allowed
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  502 Command not implemented
  504 Command parameter not implemented
  421 <domain> Service not available, closing transmission channel
EXPN
  250 Requested mail action okay, completed
  550 Requested action not taken: mailbox unavailable
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  502 Command not implemented
  504 Command parameter not implemented
  421 <domain> Service not available, closing transmission channel
HELP
  211 System status, or system help reply
  214 Help message
  500 Syntax error, command unrecognised
  501 Syntax error in parameters or arguments
  502 Command not implemented
  504 Command parameter not implemented
  421 <domain> Service not available, closing transmission channel
NOOP
  200 (nonstandard success response, see rfc876)
  250 Requested mail action okay, completed
  500 Syntax error, command unrecognised
  421 <domain> Service not available, closing transmission channel
QUIT
  221 <domain> Service closing transmission channel
  500 Syntax error, command unrecognised
TURN
  250 Requested mail action okay, completed
  502 Command not implemented
  500 Syntax error, command unrecognised
  503 Bad sequence of commands

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