All sent emails are returned as "blocked"
My wife has a regular sender (her sister) who has suddenly (3 days ago) found that all the emails she has sent to my wife are returned as "blocked". She has checked with her service provider who is of the opinion that the problem lies with us, not hem. I have had difficulty in trying to find the source of this problem which affects both my wife's iPhone and iPad. As far as we can tell, no other sender is having the same problem.
It seems to me that, because the problem affects 2 devices, the problem is likely to affect a common point for both which would be the BT server. However, in an effort to solve the problem I have:
1. Checked using my laptop that none of of the "blocked" emails are showing on the BT server.
2. Shut down and reopened both devices.
3. Deleted my wife's sister's email address from my contacts and re-entered it on both devices.
4. Checked that there are no blocked senders in the email app on the iPhone.
5. Checked that there are no blocked senders on my BT internet account.
One thing I have been unable to check is the blocked senders on my wife's iPad which uses OS 12.5.7 which does not have a blocked senders facility on Settings > Mail > Threading where I would expect to find it.
Any help would be much appreciated.
[Re-Titled by Moderator]
iPad mini, iOS 12