SU unix sites mail broken...

[mogul at su-navajo.arpa]

From: Jeff Mogul <mogul at su-navajo.arpa>

If you have a /usr/lib/sendmail.fc ("frozen configuration") on your
system, when you change anything important (the sendmail binary,
/usr/lib/sendmail.cf [of course], or the set of names for your machine
as in this case) you MUST rebuild sendmail.fc: "/usr/lib/sendmail -bz"
and then kill off and restart the sendmail daemon.

This is yet another thing that sendmail could have checked for, but
doesn't.  Too bad.