reason things are as they are -- Perry said:
This (using err("mailwrapper")) is intentional. Mailwrapper plays ugly
games with argv[0] and thus it is often difficult for people to know
that the error isn't from "mailq" or "sendmail" but from
mailwrapper -- having mailwrapper add an indication that it was really
mailwrapper running was a requested feature.
permitting users to choose between sendmail and other mail systems with a
simple configuration file change. Not yet turned on -- this is being
committed so people can beat on it.
lukem