🚀 go-pugleaf

We are running smail3.1 here, and we occasionally get mail that smail
will not accept.  The problem is "To:" lines of the following form:

	To: some.thing.or.another.;@some.where

Smail complains that the ";" does not terminate a group.  I examined
RFC-822, and it appears to me that this is not a valid address.  If
the intent is that "some.thing.or.another.;" be a group, then it is
missing a colon.  If it is not a group, then the semicolon is a special
character, and should be quoted.

I know very little about mail headers, so I would appreciate any comments
on the subject.  Smail is not following the "be liberal in what you
accept" policy here, but I would like to know if this form of addressing
is valid or not before I go munging the code.

Thanks,
Lee Ziegenhals (lcz@sat.datapoint.com)