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I reckon it's more common than most small volume senders (eg conveyancing solicitors) realise. No feedback loop and they're not exactly scrabbling around for business so if an email is not delivered, they'd likely not know or care.
The BT thing probably masks the issue. Non DMARC users probably even benefit from the open relay nature of that set up.
For the non-email nerds; be wary of emails sent to you by solicitors.
Interesting that Gmail dropped the mail, didn't even bulk it - if that behaviour was common to the MAGY then change might happen faster.