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 Andrew S wrote:

 RoyMacdonald wrote:

I don't think any of that applies to my BT email address Kim. it's roy123456 (at) btinternet.com. Unless they use a special server unlike anyone else's. And why did they used to accept it but no longer do?
I've only just caught up with this thread but For What It's Worth, the answer almost certainly lies in the 'btinternet.com' - yes, they do 'use a special server', as does Outlook.

IN another hat I run a mail system for a small charitable organisation. We have endless problems sending mail to both btinternet.com and hotmail/outlook.com addresses. The spam filters on these two systems are not only unusually aggressive but also silently discard suspected spam email without notification to either sender or recipient.

Most mail systems respect SPF, DKIM and DMARC message authentication but BTinternet and Outlook will discard even perfectly authenticated messages. To accept a message for delivery or relay and then to just delete it seems a clear violation of SMTP protocol but that's what they do. The users of these systems must be missing substantial amounts of mail without knowing it - much of it will be junk but a small amount will be genuine stuff.

Unfortunately the only solution is to change your email provider. Even Gmail returns rejection messages to senders and spam notifications to recipients.

In an ideal world, the BT/Outlook/Hotmail/Gmail users would complain to their provider that 
their service was losing mail and was therefore unfit for purpose, or indeed move to another provider that doesn't.  What 
actually happens is they complain to $small_organisation that their 
messages aren't getting through, and that everything would be fine if 
only they ditched that weird info@smallorg.org.uk thing in favour of a 
smallorg@outlook.com (or whatever) address like normal people.
BT/Google/Microsoft know this, which is why they persist in doing it.

Edited by Kim - 08 March 2025 at 5:52pm