Am 19.09.2012 16:34, schrieb Michael Orlitzky: > The only one that matters is RFC 5321, "The local-part of a mailbox MUST > BE treated as case sensitive."
but in the real world you can use myn...@domain.tld and myn...@domain.tld for any mail-address and on most mail-systems there is a good reason why mailbox == email But practically, > * What do we do with existing mailboxes User1 and user1? the main question is WHO in the world starting with the same users in different cases? without u...@domain.tld "user1" and "User1" leads to collisions and MANY errors because 99 out of 100 users are not aware of case-sensitivity because it does not matter on most servers
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