Oh, I was getting hammered with those (though I’m not in Latin America). They were all coming in via SendGrid (Twilio) and were constantly flying just under the radar in our spam filters.
Over three weeks, I sent probably close to 50 spam reports to SendGrid with full headers and everything. Not a single one of those abuse reports was acknowledged, and there was absolutely no drop in the frequency or quantity of those spam/phishing emails.
Since none of SendGrid’s listed customers were any my org would be dealing with, we finally just blocked (so far, anyway) three of their /16 subnets.
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Oh, I was getting hammered with those (though I’m not in Latin America). They were all coming in via SendGrid (Twilio) and were constantly flying just under the radar in our spam filters.
Over three weeks, I sent probably close to 50 spam reports to SendGrid with full headers and everything. Not a single one of those abuse reports was acknowledged, and there was absolutely no drop in the frequency or quantity of those spam/phishing emails.
Since none of SendGrid’s listed customers were any my org would be dealing with, we finally just blocked (so far, anyway) three of their /16 subnets.