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SMTP Error Codes

550 5.7.1 We do not relay, account limits apply

550 5.7.1 We do not relay

530 5.7.1 Authentication required - AUTH

550 5.7.1 You have rights to send mail to local domains only

550 5.7.1 Access not allowed

550 5.7.1 Access to not allowed by rules

550 5.7.1 Permission denied

550 5.1.1 Unknown local user

550 5.1.1 Unknown user; rejecting

551 5.1.1 No such user found

551 5.1.1 No such mailing list found

552 5.5.3 Too many recipients

554 5.3.4 Message size exceeds fixed maximum message size

554 5.7.1 Message cannot be accepted, virus found

554 5.7.1 Message cannot be accepted, content filter rejection

554 5.7.1 Message cannot be accepted, spam filter rejection

554 5.2.2 Maximum mailbox size exceeded

554 5.3.1 Maximum message size exceeded

554 5.7.1 Message cannot be accepted, filter rejection

500 5.5.1 Command unrecognized

501 5.5.2 Domain name required

501 5.5.2 Unbalanced

501 5.5.4 Syntax error in parameters scanning

501 5.5.1 HELO/EHLO requires domain address

501 5.0.0 Authentication canceled

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SMTP Error Codes

550 5.7.1 We do not relay, account limits apply

550 5.7.1 We do not relay

530 5.7.1 Authentication required - AUTH

550 5.7.1 You have rights to send mail to local domains only

550 5.7.1 Access not allowed

550 5.7.1 Access to not allowed by rules

550 5.7.1 Permission denied

550 5.1.1 Unknown local user

550 5.1.1 Unknown user; rejecting

551 5.1.1 No such user found

551 5.1.1 No such mailing list found

552 5.5.3 Too many recipients

554 5.3.4 Message size exceeds fixed maximum message size

554 5.7.1 Message cannot be accepted, virus found

554 5.7.1 Message cannot be accepted, content filter rejection

554 5.7.1 Message cannot be accepted, spam filter rejection

554 5.2.2 Maximum mailbox size exceeded

554 5.3.1 Maximum message size exceeded

554 5.7.1 Message cannot be accepted, filter rejection

500 5.5.1 Command unrecognized

501 5.5.2 Domain name required

501 5.5.2 Unbalanced

501 5.5.4 Syntax error in parameters scanning

501 5.5.1 HELO/EHLO requires domain address

501 5.0.0 Authentication canceled

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