What do the SMTP error / reply codes mean? (SMTP errors).

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What do the SMTP error / reply codes mean?

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Here is a reference table of SMTP error / reply codes and a brief description of their meaning:

Code	Description
211	System status or system help reply.
214	Help message.
220	Domain service ready - ready to start TLS.
221	Domain service closing transmission channel.
250	OK - queuing for node node started - requested mail action okay, completed.
251	OK - no messages waiting for node node - user not local will forward to forwardpath.
252	OK - pending messages for node node started - cannot VRFY user but will accept message and attempt delivery.
253	OK - messages pending - messages for node started.
354	Start mail input - end with <CRLF>.<CRLF>.
355	Octet-offset is the transaction offset.
421	Domain service not available - closing transmission channel.
432	A password transition is needed.
450	Requested mail action not taken: mailbox unavailable - ATRN request refused.
451	Requested action aborted - local error in processing - wnable to process ATRN request.
452	Requested action not taken - insufficient system storage.
453	You have no mail.
454	TLS not available due to temporary reason - encryption is required for requested authentication mechanism.
458	Unable to queue messages for node node.
459	Node node not allowed: reason.
500	Command not recognized 'command' - syntax error.
501	Syntax error - no parameters allowed.
502	Command not implemented.
503	Bad sequence of commands.
504	Command parameter not implemented.
521	Machine does not accept mail.
530	Must issue a STARTTLS command first - encryption required for requested authentication mechanism.
534	Authentication mechanism is too weak.
538	Encryption required for requested authentication mechanism.
550	Requested action not taken - mailbox unavailable.
551	User not local - please try forwardpath.
552	Requested mail action aborted - exceeded storage allocation.
553	Requested action not taken - mailbox name not allowed.
554	Transaction failed.

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