[lug] qmail issues...
mec at dotorg.org
Wed Jan 15 10:09:05 MST 2003
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On Wednesday 15 January 2003 09:38, Jeff Schroeder wrote:
> > I have a user (local delivery) that I just created, with a capital
> > letter in the user name.
> What's the general consensus on using capital letters in usernames
> and/or e-mail addresses?
> IIRC, qmail (and perhaps Sendmail) automatically lowercase the
> username and domain name of an address before even attempting to
> deliver it. In this way there are several ways to write an address:
> jeff at neobox.net
> Jeff at neoBox.net
> JeFF at neoBoX.NEt
qmail does lowercase the 'local' part of the email address. However,
Unix usernames are case sensitive, as a general rule, and qmail treats
capitalized usernames as non-deliverable, as a general rule. (See my
followup post for more info.)
> In that sense, I always use strictly lowercase for all my e-mail, but
> of course there are lots of people who capitalize initials and so
> forth to (perhaps) clarify their name.
> On the subject of usernames, I've always used all-lowercase with a
> maximum of eight characters, although I know *nix will support
> capitalization and longer names. Is it common to do so?
The 8-character limit has historical and current precedent -- a lot of
classic-unix utilities and systems (including Solaris 8, and possibly 9
- -- I haven't checked yet) won't recgonize characters past the 8
character boundary in the username. Same for passwords. Only systems
with newer utilities (such as Linux or *BSD with support for MD5/SHA1
passwords) support longer usernames or passwords.
As a general rule, I tell users to stick with 8 characters or less for
their Unix usernames. Most of the old-hands already know this, and
some new ones, too. It depends on what OS mixture, etc. I'm running as
to how stringently I enforce it.
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