smtp response codes

code meaning                                                          
211 System status or system help reply
214 Help message
220 Service ready
221 Service closing transmission channel
250 Requested mail action okay
251 User not local will forward to
252 Cannot VRFY user but will take message and attempt delivery
253 messages pending for node started
354 Start mail input end with
355 Octet-offset is the transaction offset
421 Service not available
432 A password transition is needed
450 Requested mail action not taken: mailbox unavailable
451 Requested action aborted: local error in processing
452 Requested action not taken: insufficient system storage
453 You have no mail
454 TLS not available due to temporary reason
458 Unable to queue messages for node node
459 Node node not allowed: reason
500 Syntax error
501 Syntax error in parameters or arguments
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
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


Enhanced error codes

code meaning                                                                
x.1.0 Other address status
x.1.1 Bad destination mailbox address
x.1.2 Bad destination system address
x.1.3 Bad destination mailbox address syntax
x.1.4 Destination mailbox address ambiguous
x.1.5 Destination mailbox address valid
x.1.6 Mailbox has moved
x.1.7 Bad sender’s mailbox address syntax
x.1.8 Bad sender’s system address
x.2.0 Other or undefined mailbox status
x.2.1 Mailbox disabled, not accepting messages
x.2.2 Mailbox full
x.2.3 Message length exceeds administrative limit
x.3.0 Other or undefined mail system status
x.3.1 Mail system full
x.3.2 System not accepting network messages
x.3.3 System not capable of selected features
x.3.4 Message too big for system
x.4.0 Other or undefined network or routing status
x.4.1 No answer from host
x.4.2 Bad connection
x.4.3 Routing server failure
x.4.4 Unable to route
x.4.5 Network congestion
x.4.6 Routing loop detected
x.4.7 Delivery time expired
x.5.0 Other or undefined protocol status
x.5.1 Invalid command
x.5.2 Syntax error
x.5.3 Too many recipients
x.5.4 Invalid command arguments
x.5.5 Wrong protocol version
x.6.0 Other or undefined media error
x.6.1 Media not supported
x.6.2 Conversion required and prohibited
x.6.3 Conversion required but not supported
x.6.4 Conversion with loss performed
x.6.5 Conversion failed

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