» Spam Lab II - Email Marketing & Delivery Blog - Enterprise Email Application Software Blog

I've known for a long time that some major email gateways require a sender to have a reverse pointer record for the sending ip. I also know that many email server administrators I've talked to do not know that this is required. I wondered what percentage of spam came from ips with reverse pointers and was surprised to learn that in our sample 70% came from ips with reverse pointers.