Spam error message

Gunda

New Email
I use Thunderbird email. Have no problem receiving mail from anyone, except from someone I've been writing to for 10 years.. His mail to me is rejected due to spam.. citing 554 5.7.1. We are genealogists and exchange family tree data. He has sent me data daily for 10 years.. why is it now blocked? How can we get the block lifted? Gunda
 
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