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Re: POP3 mailbox names and IMAP userids
Date: Sun, 16 Feb 2003 11:34:58 -0500
From: John C Klensin <john-ietf@xxxxxxx>
In practice, POP3 and IMAP accounts (mailboxes and user ids,
respectively) have two important properties:
(i) Unlike email addresses, which people type, enter
into address books, and pass around to each other using
mechanisms other than mail headers and envelopes, they
are typically configured once per user (or at most, once
per client machine). There are some separate issues
when these things are accessed through web interfaces
that simulate MUAs, but those are, well, separate issues.
This is incorrect. In IMAP they are manipulated on ACLs and may form
part of a hierarchy. Being able to understand another username
("principal" in the Kerberos world) is very important for any
collaborative system. It is also important to users that they match up
with e-mail addresses.
My Kerberos principal ("leg@xxxxxxxxxxxxxx") matches up nicely with my
e-mail address ("leg@xxxxxxxxxxxxxx") and both might appear in a
Unfortunately there's no BCP on principal names and authorization, so
IETF protocols have different ideas of "user", "realm", "dn",
etc. While it's possible for these things to diverge from e-mail
addresses, it is highly undesirable that they do so.