On 17.04.24 08:43, Aki Tuomi wrote:
On 17/04/24 00:51, John Stoffel via dovecot wrote:
>>>>>> "Peter" == Peter via dovecot <dovecot@dovecot.org> writes:
Generally speaking you want auth to be case-
sensitive, but go ahead and
try it to see if it fixes the issue.
Umm... not for emails you don't. Since the j...@stoffel.org
and j...@stoffel.org and j...@stoffel.org are all the same
email address
No they aren't. The *host part* is case insensitive because the DNS is,
but nothing in the RFCs suggests that the *user part* may be (generally)
treated as such. That only came about when the makers of a certain,
famously case insensitive OS started selling a mail server software
better aligned with their habits.
(Back with SunOS, when account names automatically yielded deliverable
e-mail addresses, my dpt. had a standing rule that admins would have an
unprivileged account like, e.g., "bern" and a separate UID=0 account
"Bern" for the admin work. Luckily, the login(1) triggered its OH, IT
SEEMS THAT THIS TERMINAL SUPPORTS ONLY SINGLE CASE mode only if the
username was *entirely* in uppercase, not on the first character ...)
Having that said, nothing keeps you from setting up your MTA/MDA so as
to ignore case entirely (because people manually entering addresses
never make typos, but erroneously slip onto <SHIFT> or <CAPSLOCK> all
the time, I suppose ...), but it's a major no-no for (intermediate) MTAs.
Unfortunately some systems uppercase (or downcase) your email when sending mail
to you.
In particular, websites you create an account on, apparently in fear
that joe@shmoe would otherwise be able to create multiple accounts with
Joe@shmoe, jOe@shmoe etc. etc.. They rarely object to plussed user
addresses or single-person-owned domains that could have a catchall
configured, though ...
(I *should* have tried a user part with "ß" on an upcaseing online
service back when that umlaut officially *didn't have* an uppercase
version ... ;-)
Kind regards,
--
Jochen Bern
Systemingenieur
Binect GmbH
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