In some cases it’s not enough to blacklist a sender, because spam is usually sent by random accounts on random domains. In such cases it’s more efficient to blacklist the sender’s relay server, as it may manage the sending of spam for multiple spammers’ domains. To do this, click on Blacklist sender's relay server in the Message Viewer page. The Protector will add to the list of blacklisted domains the first relay server in the list of servers through which the email passed.
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