> Email addresses in upper-case would be faulty, I think.
Not necessarily. ;-)
Host names (eg that after the @) are by definition case insensitive.
The actual recipient (aka RFC-822's local-part, that before the @)...well,
they're trickier. They're supposed to be "case preserved"; but the reality
is that it's totally dependent upon the server.
Many servers directly map the local part to a file name in which they store
incoming messages. Thus, a Macintosh server would most likely be case
insensitive, and an old-school UNIX server would be case sensitive (I'm told
that some newer UNIX filesystems are case insensitive).
Under most versions of Sun's Solaris, the local-part is mapped to lowercase.
Unless you're running the wrong version of NIS, in which case, your mail
server suddenly becomes case sensitive.
We won't explore the vagaries of email that is eventually routed to
Microsoft Exchange, Quickmail, X.400, or any of the other "odd" mail
systems.
Short version: tweak the case of that after the @ to your hearts content.
Tweak the case of that before the @ with trepidation.
mikel
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