Justin Mason wrote:
As Clifton said, this is very similar to what the HELO_DYNAMIC_* ruleset does. I strongly recommend taking a look at those and getting your head around them to ensure you don't duplicate them... and if you find new ones with good hitrates, please drop us a line with the rules so we can try them out ;)
Except, as I've said, I'm not looking at the helo string. I'm looking at the rdns hostname. I actually don't care one little bit about the helo string. I care about the rdns hostname. :-)