Exchange 2010 on SBS2001.
Mail flow through BTconnect works fine, except for emails we try to forward to external contacts, which bounce to the sender with ‘mail.btconnect.com #550 Not permitted’. I’ve found 3 possible solutions on various forums, namely:
Which I implemented but it didn’t help;
2) Call BT and have them add the sending domain to BT Mail Relay;
3) A workaround involving routing emails via DNS and setting up a reverse DNS record. I’ve heard of reverse DNS but never attempted to set it up, it’s always mystified me.
Grateful for any advice on either these or any other possible solution.