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SMTP Error Codes

Interpretation of SMTP 5xx errors

 

Most common SMTP errors with a short description and action to take when this error occurs: 
 

Code

Enh. Code

Message

Description

Action

500

5.5.1

Command unrecognized

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

Review the syntax of the last command and try again.

Another possibility is that you are trying to use telnet and the telnet connection to your server is not allowed. Check the Admin console - Mail service - Security - Protocols.

501

5.5.2

Domain name required

Sender has no domain specified (usually in MAIL FROM)

Specify the senders' domain name and try again.

The problem may be in your e-mail client, not the MailServer. If your e-mail client is not properly configured with a domain name this could happen.

501

5.5.2

Unbalanced

SMTP session syntax invalid. (usually unbalanced brackets)

Check the syntax of the last command and the configuration of various DAT files.

501

5.5.4

Syntax error in parameters scanning

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

Check the syntax of the last command.

501

5.5.1

HELO/EHLO requires domain address

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

Greet MailServer again with correct HELO/ELHO command.

501

5.0.0

Authentication cancelled

The process of authentication was cancelled for any reason.

Restart the authentication process by using proper command.

501

5.7.0

Authentication failed

The username/password combination provided during authentication was invalid.

Reenter both the username and the password and authenticate again.

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 issued out of sequence. For example command RCPT TO used before MAIL FROM or DATA command used when RCPT TO command was not accepted.

Solution depends on the situation where this error occurred. Check last few commands sequence.

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.

You have to use HELO or EHLO command.

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.

Use the command AUTH with proper authentication type.

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

 

Check the account limits for the particular user account and whole domain.

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) MailServer is blocking access by a black list filter. or

2) Reject if originator's domain is local and not authorized option turned on. or

3) Sending to a mailing list set to members only.

1) Review MailServer B&W filter settings or set a bypass file.

2) Local users have to be authorize before sending mail, this set up is in their email client, POP before send, use SMTP Authentication or Allowed relay IP.

3) Add your sender address to the mailing list you are sending to.

550

5.7.1

Permission denied

 

 

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 much 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.

Review the content filter settings in the MailServer Administration console.

554

5.7.1

Message cannot be accepted, spam filter rejection

Message is probably spam.

If you do not think this message is spam, try to alter the configuration of the MailServer Instant Anti-spam engine. Or review your Black and White list filters for sender rejection

 

 

Message deleted by filter

 

Alter your filter configuration. Usually Challenge Response or Black and White list in Webmail or MailServer Admin

 

 

Message challenged by filter

 

 

554

5.2.2

 

Maximum size exceeded.

Check global settings, domain options and user mailbox settings. Webmail also has a max message size. Log on to Webmail, Settings, Administrator Settings.

554

5.3.1

 

Maximum message size exceeded.

 

554

5.7.1

Message cannot be accepted, filter rejection

The message was rejected.

Check your filters settings and configuration.


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