Mailtraq - the Complete Email Server

Enstar for Mailtraq email server sales & support
Making world-class Internet technology affordable  

Search for:

Advanced search

KB06082101 Messages returned marked 'Blacklisted'

Blacklisted Problems

1). Blacklisted

If you are getting email returned to you marked 'Blacklisted' remember that your organization's Senders must either be within the LAN as defined at Options | Server*, to be able to send mail through Mailtraq, or they need to be using an SMTP-Auth connection. If not you will see messages similar to:

The following recipient(s) could not be reached: 

      Jane Doe on 8/25/2008 8:17 AM

            554 blacklisted (

In this example John Smith (jsmith) was sending email from a machine that was not included in the LAN definition for ( and so the message he was tying to send to Jane Doe was rejected by Mailtraq.


Users inside the LAN (Local Area Network):
So - make sure your LAN definition correctly describes your local area network, and the IP addresses your Users will be connecting from. Read how here ... 

Users outside the LAN
Users outside the LAN need to be using an SMTP-Auth connection.  Read how here ...


Additional information:

550 type errors

See 'Mail Relay Denied' resolution...








Keywords: kb smtp
Mailtraq Highlights...
 SMTP Server     Mailtraq SMTP email server video IMAP Server     Mailtraq IMAP email Server video
 POP3 Server     Mailtraq POP3 email server video Proxy Server     Mailtraq proxy email server video
 Webmail Server     Mailtraq webmail email server video Mailing-list Server     Mailing list email server video
 Groupware Services     Mailtraq groupware email services video Spam and Virus control     Spam and virus control email server video


   Copyright © 2003 - 2011 Enstar Ltd, Enstar LLC & Fastraq Ltd. All rights reserved. Privacy policy.
   Mailtraq® is a registered trademark of Fastraq Limited.