Idea shared by Chris - 1/30/2019 at 12:25 PM
Our anti-spam vendor offered a new type of blacklist subscription from http://msbl.org/index.html

Apparently this list contains email addresses of spammers and works similar to RBL or URIBL where Smartermail would need to extract the email address and send it to their servers like a DNS query. 

Would love to have support for this in the future!

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