I recently set up a mail server with a brand new domain.
I can send emails to gmail, outlook, private domains... but all emails to btinternet.com bounce back.
Remote-MTA: dns; mx.bt.lon5.cpcloud.co.uk [188.8.131.52]
Diagnostic-Code: smtp; 522 email sent from mydomain.com found on industry URI blacklists (Spamhaus/Invaluement/ReturnPath) on 2018/07/06 20:02:31 BST, please check for a listing on these external blacklists. Postmaster cannot help you if you are listed on these systems.
Attempts to resolve:
I have seen many similar problems on these forums, and nobody seems to have found a solution. Can anyone help?
Solved! Go to Solution.
Hi, welcome to the forums.
Can you say how you set up the mail server? What IP address are you referring to?
Not sure what you mean when you say you've tried sending simple emails and "realistic" emails to multiple addresses. Have you tried sending to one email address, a basic email with no attachments or embeded URLs?
BT use Cyren for (some of) their blocking. Have a look here :-