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SMTP reply codes

See for the basic specification of SMTP; see also for important additional information.

See and for information about enhanced status codes.

Check the 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	Service ready
221	Service closing transmission channel
250	Requested mail action okay, completed
251	User not local; will forward to
354	Start mail input; end with .
421	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	does not accept mail (see rfc1846)
530	Access denied (???a Sendmailism)
550	Requested action not taken: mailbox unavailable
551	User not local; please try
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
	220	Service ready
	421	Service not available, closing transmission channel
	250	Requested mail action okay, completed
	500	Syntax error, command unrecognised
	501	Syntax error in parameters or arguments
	504	Command parameter not implemented
	521	does not accept mail [rfc1846]
	421	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	250	Requested mail action okay, completed
	251	User not local; will forward to
	550	Requested action not taken: mailbox unavailable
	551	User not local; please try
	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	does not accept mail [rfc1846]
	421	Service not available, closing transmission channel
	354	Start mail input; end with .
	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	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
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	250	Requested mail action okay, completed
	251	User not local; will forward to
	550	Requested action not taken: mailbox unavailable
	551	User not local; please try
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	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	Service not available, closing transmission channel
	200	(nonstandard success response, see rfc876)
	250	Requested mail action okay, completed
	500	Syntax error, command unrecognised
	421	Service not available, closing transmission channel
	221	Service closing transmission channel
	500	Syntax error, command unrecognised
	250	Requested mail action okay, completed
	502	Command not implemented
	500	Syntax error, command unrecognised
	503	Bad sequence of commands

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