OE6 rejects some messages

My wife has had reports from two friends that they can no longer e-mail her;
I have an address in the same domain, and I can receive from these friends
with no problem - him@xxxxxxx works fine - her@xxxxxxx causes a bounce
back - only to two people. She can send to these people, but their replies
bounce. One is a US domain; the other foreign (.dk).

I've checked blocked sender list and message rules - not there. Where else
to look?

Any ideas?


.

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