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Re:Spam blacklisting is out of control by terom on Sunday February 06, 2022 @03:22AM (#30230490)
But this thread is about companyB.com blocking incoming email delivery from companyA.com :D

You need to involve legal.com.

Re:Spam blacklisting is out of control by quartesixte on Wednesday February 09, 2022 @02:05AM (#30269819)
Yeah I guess that’s when you rain down BigLegal.com.

Or you send certified mail with return signature requested. Snail mail to the rescue?