🚀 go-pugleaf

Some Unix systems with uucp links are case sensitive.

Unix sendmail converts all addresses to one case when comparing
domain-name and userid information. It should leave the case the way in
was sent in the header when it forwards a message.

We recently had a problem on a Unix system here because a userid
(login name) had been created that contained upper and lower case
letters. The result was that the user could not receive mail because
sendmail was looking for a lower-case only login name.  Thus mail
to "UsEr" would be forwarded to "user" (if "user" existed) or generate
an unknown user error. So case is also an issue with the local part
of the address on some systems.

Bill Wells
wcwells@Berkeley.ARPA