Can't Email BT Addresses

[byates80]

Every time any of the email clients on my server with ANS email a BT address they receive the error below. The server and IP address are not on any known blacklists, and can email every other type of address perfectly fine.

The problem is that the error is so vague it doesn''t give us any indication of how to fix things. Please can someone help. There must be something happening at the BT side which is preventing anyone replying to or emailing BT addresses.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<***@btinternet.com>: host mx.lb.btinternet.com[213.120.69.2] said: 554
Service not available - access denied (in reply to MAIL FROM command)
Reporting-MTA: dns; server.***.co.uk
X-Postfix-Queue-ID: 4DF6917A0830
X-Postfix-Sender: rfc822; ben@***.co.uk
Arrival-Date: Tue, 14 Mar 2023 10:39:09 +0000 (GMT)

Final-Recipient: rfc822; ***@btinternet.com
Original-Recipient: rfc822;***@btinternet.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx.lb.btinternet.com
Diagnostic-Code: smtp; 554 Service not available - access denied

[gg30340]

See the following link and ensure that you are meeting all the criteria.

BT Email - best practices for postmasters and senders of email | BT Help

If you are you should contact the BT Postmaster at the email address supplied in the link to see if they can help.

BT previous report it would appear that the postmaster is not very fast at replying so you may need to keep emailing until you do get a reply.

[byates80]

Thank you. I reached out to Postmaster who did reply with the message below, however it didn't fix the problem, so I have referred back to them a second time.

Thanks for your enquiry to BTinternet.com postmaster.

We have reported the issue to our spam engine provider and they have been able to make changes based on the information we have found in the logs. 
Emails should no longer score as spam. Please refer back to us if it is still occurring.