I've tried searching and reading about other people's issues but I can't find anything that helps, so I'll try posting a question.
If I try to 'reply to' or 'create a new' email to any address in one particular domain (that I own) I always get the following error:
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
The email addresses often communicate with me and to date I've never had any issue. Now every single email address for the domain in question instantly turns orange once it's typed and says 'the address may not be valid'. If I then try to send I instantly get the above reply.
I've contacted the domain host and they say that there is nothing they can do from their side and that the issue is something to do with outlook/hotmail.
Can someone please help?
Many thanks,
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