[schmonz]

"This implementation" is notqmail, which none of the netqmail people are involved in.

netqmail 1.06, which none of us notqmail people were involved in, was produced by a handful of people I have often referred to as "list elders". They were very informed, very conservative, and very careful.

Nothing wrong with heuristics. It's a busy world out there. I appreciate that you're aware you're using one here, and I thought you might like to know it's led you astray. As a notqmail developer, I hope we live up to the standards set by the netqmail folks.