E-mail address forced to lower case in user ID?!?

[Stainless Steel Rat]

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* Rich Wales <richw at webcom.com> Fri, 26 Feb 1999
| As far as I'm aware, very few (if any) modern e-mail systems actually
| care about upper vs. lower case in their own local user names.

RFC 822 specifically states that local parts of mailboxes *ARE* case
sensitive, with the singular exception of the Postmaster local part.

| But since the standard permits case sensitivity, it seems to me inappro-
| priate to force the left-hand side of the address to lower case when
| constructing a key's user ID.

Case smashing of the domain part is okay, but case smashing of the local
part is verboten.
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