Is it safe (or mostly safe) to simply block attempts to deliver mail with a helo that is only an IP address? (I am talking about only on postfix/stmpd and obviously not on postfix/submit or related).
I have about 50,000 NOQUEUE reject from "helo=<[193.32.160.151]>" over the last week, for example. I see very few otherwise, and all are obviously spam with return addresses like account-security-nore...@091773.com or apple_supp...@0904.ru. -- A sadder and a wiser man he rose the morrow morn.
