On Apr 18, 2009, at 2:05 AM, Bill Cole wrote:
Scott Silva wrote, On 4/17/09 1:27 PM: [...]
AFAIR the RFC's state that all e-mail addresses are acted on in
lowercase when being manipulated. The upper case parts are left intact only for
human beings to read.That is very wrong. Email address local-parts MUST be treated as
case-sensitive in SMTP because historically many hosts (including
most systems resembling Unix) have treated usernames as case- sensitive and used local-parts that map to directories on case- sensitive filesystems. So RFC's 821, 822, 2821, and 5321 all
explicitly state that local-parts are case-sensitive and RFC's 2822
and 5322 say it indirectly by way of the ABNF spec. The one
exception is "postmaster", which gets special treatment as the only
address that has to exist in every domain.
I have no strong opinions about this, but http://mailman2.u.washington.edu/pipermail/imap-uw/2008-September/002190.htm...