Tom Zeltwanger asked,
| Can anyone tell me where I can find a detailed description of the rules
| used by formail when generating a reply header? When I receive messages
| with a From_ header and a Return Path: header, it seems to use these.
| My understanding is that it should use the address in the From: header.
For a few versions in a row, formail -r mistakenly preferred From_ (Return-
Path: and From_ almost always have the same address in them) to all other
headers. That was fixed along the way.
Look at the bar graphs in the source (in src/formail.c, I think) of your
current version. They tell the relative rankings of various headers for
formail -r and formail -rt.