Am Tue, 08 Oct 2019 08:13:29 -0400 schrieb James Cassell via dovecot dovecot@dovecot.org:

On Tue, Oct 8, 2019, at 7:58 AM, Julian Kippels via dovecot wrote:

...

Hi,

I have recently updated from Dovecot 2.2 to 2.3. Since I have noticed that vacation responses from sieve are not working the same anymore. For example, my sieve script looks like this:

vacation :days 1 :addresses ["Kippels@hhu.de","julian.kippels@hhu.de"]

it used to be that I got a vacation response if I sent a mail to kippels@hhu.de and Kippels@hhu.de. Now I only get a response for Kippels@hhu.de, not for kippels@hhu.de. I cant say for sure, but I suppose this behaviour changed with the update. If not, why could this have happened? And in any case, how can I enable case insensitivity?

I took a look at the RFCs. It appears that this change is not in accordance with the relevant standards. SIEVE says 'the "i;ascii-casemap" comparator (which treats uppercase and lowercase characters in the US-ASCII subset of UTF-8 as the same). If left unspecified, the default is "i;ascii-casemap".' https://tools.ietf.org/html/rfc5228#section-2.7.3

Since there is no mention of comparators in the Vacation RFC, it should fallback to case-insensitive: https://tools.ietf.org/html/rfc5230

You could try working around the issue by adding to your vacation statement: :comparator "i;ascii-casemap" -- but in any case, I'd file a bug about the non-standard behavior.

V/r, James Cassell

...

Thanks Julian

Unfortunately adding the :comparator statement to vacation results in an error while compiling the script:

managesieve: line 5: error: unknown tagged argument ':comparator' for the vacation command (reported only once at first occurrence).

Since https://www.dovecot.org/bugreport-mail states that bugs should be reported to this mailing list, please consider this a bug report.

Obligatory information as follows: doveconf -n can be found at https://pastebin.com/pjxFNfWr Dovecot and Pigeonhole version 2.3.7.2 installed from repo.dovecot.org on CentOS 7.

Kind Regards Julian