Blacklist doesn't work

Geronimo

New Email
I use mail.com and gmx.com for email, and can't get the blacklist function to work on either provider. I've tried to list some some unwanted addresses many times - including internal addresses from the providers (I don't want constant notifications) - but nothing works. It always tells me that the address has been successfully blacklisted. Anyone know what I'm doing wrong?
Thanks for your help

Geronimo
 
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