🚀 go-pugleaf

In article <Bwuxv4.A59@world.std.com> rad@world.std.com (Richard Doty) writes:
>Most of the sendmail.cf files I have at hand specify the h flag for the
>uucp mailer.  This preserves case in the hostname, and I wonder "why do
>that?"
>
>Recently I saw a message fail because sendmail found a
>case-insensitive match and handed off to a case-sensitive program,
>namely uux.
>
>Is there some historical or otherwise reasonable explanation for this?

In a sense, you have answered your own question.  Since 'uux' is case
sensitive, sendmail should preserve the case.  However, as a practical
matter, this is only important if you have direct UUCP neighbors with
upper case characters in their UUCP names.  If not, it is probably wiser
not to specify the 'h' flag.

When sendmail resolves to a mailer/host with

		$#mailer $@host $:address

the effect of not having an 'h' flag is that the host (the part immediately
following '$@') is mapped to lower case.  The case is still preserved
in the address, even if that also contains the hostname.