Mail is returned Blacklisted or with a 550 / 554 error

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Mail is returned Blacklisted or with a 550 / 554 error

Postby Susan Bunbury » Fri Aug 26th, 2005 3:58pm

Mailtraq will not allow unauthorized use of its SMTP services.

If you find that one of your Users gets mail rejected by Mailtraq with a Blacklist notice or a 55* notice:

For example:

Your Message "messagesubject" (Fri, 20 Aug 2004 12:12:16 +0200)
could not be successfully delivered to the following recipients :- [550 cannot relay for]

If you have any queries regarding this notification, please
write to

or like this

554 blacklisted (

make sure that the email client is sending from within the LAN definition at Options | Server | LAN

Note: If you see the message 550 5.7.1 we do not relay... then it is another mail server, not Mailtraq, which is refusing to relay.
Best wishes,

Sales and Initial Support
Enstar Mailtraq
User avatar
Susan Bunbury
Mailtraq Enstar Sales and Support
Posts: 359
Joined: Mon Aug 22nd, 2005 3:09pm
Location: CT, USA

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