How do we stop our emails being rejected as spam?

[MNewman]

Our's is a paid for service, so the only emails we create have been asked for (e.g. User Log In / Password reset emails).

I see this message has been posted in the past, but the link for Bulk Sender no longer works: 

https://business.forums.bt.com/t5/Email-computing-hosting-domains/All-our-domains-e-mails-to-btinter...

[highlandspring]

Check your IP is blacklisted I had the same issue and found my sons PC was sending out masses of spam without any of us realising.  Spamcop is a good service to check the issue.