[imp] handling semicolon separated addresses

[Liam Hoekenga]

> I missed the start of this thread, but semicolons aren't valid
> address separators.  Simple as that.

Acc'd to rfc822, they are:

   http://www.w3.org/Protocols/rfc822/

	3.4.6. BRACKETING CHARACTERS

	   There are three types of brackets which must occur in  matched
	   pairs, and which may NOT be nested:

	       o   Colon/semi-colon (":" and ";") are   used  in  address
	           specifications  to  indicate that the included list of
	           addresses are to be treated as a group.

Liam Hoekenga
UM Webmaster Team