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Hi John,

I am the owner and moderator of a group which is based on studying the history of a specific railway geographically based in the UK. Many of the members are also based in the UK. I just scanned through the member list and found that 217 out of 1505 have to various BT email addresses (BTInternet, BTConnect or BTOpenworld). We migrated to Groups.io last February and have sent out around 8,000 messages since then. I have not ever heard of any specifc problem affecting these BT addresses. So I would challenge your assumption that there is a general problem between BT addresses and Groups.io.

You might want to add another BT email address from someone you know and have them run some tests and see if they have the same problem. Then you can narrow it down to something in your setup specifically.

Before you test with another member, it would be worth checking if BT are sending any error messages back to Groups.io. All reputable email services provide this kind of feedback, but I wonder if BT fall into this category <smile>. Just click on "Subscription" in the left hand column, on the web version of Groups.io, and then click on the "Email Delivery History" tab. Tell use what you see there. You can try this both when you have the GroupManagersForum group open and when in your test group. This link will take you straight to the Email Delivery History in the GroupManagerForum :-

/g/GroupManagersForum/subdeliveries

If there are any messages coming back from BT email about the errors, then they will be listed there under "Most Recent Unsuccessful Attempt" or "Recent Bounces".

Regards
John Russell