Some emails from other account do NOT get forwarded to hotmail (most do)


New Email
Hello, (please read carefully)
it is regular emails that do not get forwarded. This is like 98% of my emails addressed to the other account do get forwarded, about 2% do not.
I spoke with the other provider, they have no explanation (desoite seriously considering) and they think it must be on the side of

Any ideas? I am missing some important emails due to this.

Many thanks for your help!