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Problem with outgoing emails - 5.5.0 smtp;550 "message"

Can anyone help me please. I have Small Bus Server 2003

I have a problem with outgoing emails, evertime an email
is snet external to the company/domain i get a NDR with
the following information

There was a SMTP communication problem with the
recipient's email server. Please contact your system
administrator. <mail.btconnect.com #5.5.0 smtp;550
Recipient Not Authorised [recipient rejected due to no
authorised destination groups]>

I have checked technet and can find NO information
relating to this issue.

Please help

I've spoken to my ISP no joy.
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1 Solution
Seems like it's a DNS problem with BT internet. Go on their automated tech line and it will give you alternate DNS settings for you TCP/IP connection.

Number 0800 169 0199

Several others have reported the same issue on other sites.
mtxitAuthor Commented:
Thanks for your speedy reply.

I've checked with the ISP & added alternative DNS settings, web pages are OK.  Also the message indicates that the e-mails getting sent ok but keeps getting rejected.

I checked around a bit, and it seems there are a couple of solutions to your problem. The reason is that your addresses are not recognised by BT Internet's SMTP servers. This usually happens if the sender is in a domain which is registered with a different hosting company.

1. You can register your domain name with BT Internet by this link: http://www.btconnect.com/maildomain/

2. You can transfer the hosting of your domain to BT Internet

Hopefully one of these can help you out.
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mtxitAuthor Commented:
The problem turned out to be caused by having configured ETRN to retrieve emails from the ISP hosting the emails and having the SMTP connector relaying through the ISP providing our ADSL. When we removed the ETRN setting all was well.

Thanks for your assistance.
mtxitAuthor Commented:
Is there a way I can award you the points as a thanks?
The only way is to accept my comment as the answer.
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