Knowledgebase
Mail server error codes
Posted: 09-Nov-08 1:21am

Most common SMTP errors with a short description. If you are a client of Tomahawk Technologies Inc. please cotnact us to resolve any issues.

Code

En. Code

Message

Description

500

5.5.1

Command unrecognized

The SMTP command currently used was unrecognized or is not supported by the server.

501

5.5.2

Domain name required

Sender has no domain specified (usually in MAIL FROM)

501

5.5.2

Unbalanced

SMTP session syntax invalid. (usually unbalanced brackets)

501

5.5.4

Syntax error in parameters scanning

Common syntax error. You probably mistyped last command or last string is invalid.

501

5.5.1

HELO/EHLO requires domain address

Usually when there was blank or invalid string sequence after HELO/EHLO command.

501

5.0.0

Authentication cancelled

The process of authentication was cancelled for any reason.

501

5.7.0

Authentication failed

The username/password combination provided during authentication was invalid.

501

5.7.1

 

You are not allowed to send.

502

5.5.1

Sorry, we do not support this operation

This operation is not allowed.

503

5.5.1

Incorrect command sequence

A supported command was used on invalid place. For example command RCPT TO used before MAIL FROM or DATA command used when RCPT TO command was not accepted.

503

5.5.1

Authentication already done

Error occurs by re-authentication.

503

5.5.1

HELO/EHLO command required

Greeting error. HELO/EHLO command is required.

503

5.5.1

HELO/EHLO already specified

Greeting used again.

504

5.7.6

Unrecognized authentication type

Invalid authentication type. Incorrect or none type of AUTH specified.

530

5.7.1

Authentication required [AUTH]

Authentication with command AUTH is required.

550

5.7.1

We do not relay

Server is not open for relay.

550

5.7.1

We do not relay, account limits apply

 

550

5.7.1

You have rights to send mail to local domains only

The user who gets this error is allowed to send mail only to local domains.

550

5.7.1

Access not allowed

1)SMTP Server blocked access by a black list filter. or

2) reject if originator's domain is local and not authorized option turned on

550

5.7.1

Permission denied

Occurs after a delay from original connection time.

550

5.1.1

Unknown user local

 

550

5.1.1

Unknown user; rejecting

Unknown user account. The recipient is not local, thus reject the message.

551

5.1.1

No such user found

User account is not local.

551

5.1.1

No such mailing list found

Mailing list is not local.

552

5.5.3

Too many recipients

The number of recipients exceeds the maximum of allowed recipients.

554

5.3.4

Message size exceeds fixed maximum message size

Too many data was sent by the user. User account has an amount limitation.

554

5.7.1

Message cannot be accepted, virus found

Virus was found in the message body or in the message attachment.

554

5.7.1

Message cannot be accepted, content filter rejection

Content filter applied and the message was rejected.

554

5.7.1

Message cannot be accepted, spam filter rejection

Message is probably spam.

554

5.7.1

Message cannot be accepted, spam rejection

Message is probably spam.

 

Message deleted by filter

 

 

 

Message challenged by filter

 

554

5.2.2

 

Maximum size exceeded.

554

5.3.1

 

Maximum message size exceeded.

554

5.7.1

Message cannot be accepted, filter rejection

The message was rejected.



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