Code

En. Code

Message

Description

Removal Instructions

500

5.5.1

Command unrecognized

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

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 Merak. 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 mis-typed 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 Merak SMTP 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.

Be sure «Reject if no rDNS» is NOT checked in Merak Admin console or

Put the local IP range and your email client program IP in the «Relaying from» box.

502

5.5.1

Sorry, we do not support this operation

This operation is not allowed.

You can allow/disallow particular operations and commands from the Merak Admin console — SMTP — Security node — Protocols.

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.

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. You can specify this option in Merak Admin console — SMTP — Security — Protection tab.

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.

Use AUTH command or enable/disable authentication obligation from your Merak Admin console.

550

5.7.1

We do not relay

Server is not open for relay.

Read this FAQ.

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.

There is a checkbox in Merak Admin Console, user account management — Mailbox tab. Enable or disable it.

550

5.7.1

Access not allowed

1)Merak Mail Server block access by a black list filter. or

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

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

2) local users have to authorize themselves so if they do not have this set up in their email clients and you turned this on they are not allowed to send.

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.

Behaviour and the treatment of messages coming to unknown user accounts can be set from Merak admin console — domain management — domain tab.

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.

Older versions of Merak used to follow RFC and had maxium of recepients set to 100. If you need more recipients, use mailing lists or download the latest version of Merak (support for unlimited number of recipients added).

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.

You can increase or disable amount limit from Merak Admin console — user account management — mailbox tab. Make sure all 3 levels (server, domain and user) are set to 0. (for unlimited)

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 filers settings in the Merak 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 Merak instant anti-spam engine.

554

5.7.1

Message cannot be accepted, spam rejection

Message is probably spam.

If you do not think this message is spam, try to alter the configuration of the Merak instant anti-spam engine.

Message deleted by filter

Alter your filters configuration.

Message challenged by filter

If you do not want challenge response you can deactivate it in your anti-spam settings (Challenge Response tab)

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.

Check your filters settings and configuration.