I found myself needing up apply the recent patch for sendmail against
an aging 3.6 stable box.
I took the sendmail patch for the 3.7 stable branch and applied it
against 3.6 stable. It applied cleanly with the exception of a half
dozen hunks in a couple of files. I merged those by hand and am up
and running with a rebuilt sendmail.
In case this saves anyone a little time, I've created a diff of what
I'm running against 3.6 stable. It applies cleanly. You can find it
here:
http://pokernut.net/wp-content/OPENBSD36_sendmail.patch
Michael