> Well and good, until you run across a site that distinguishes case on
> names, e.g. in Sendmail via:
>
> MODIFY_MAILER_FLAGS(`LOCAL', `+u')
>
> Which (as a rare boundary case) would allow evil spam from
> "[EMAIL PROTECTED]" with a whitelist entry for your good
> buddy "[EMAIL PROTECTED]"

Interesting.  I was under the impression that case-insensitivity was mandated 
by the RFC.

Regards,
Andrew

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