Since version 5.9.1, when automatic response is enabled, no email is sent to the sender when using time information in the Sieve rule. The out-of-office email is sent without specifying a time, i.e. only with a date. With SOGo 5.9.0 it worked with time specifications.

However, I see no difference in the Sieve rule between the one created by version 5.9.1 and the one created by version 5.9.0. I use Dovecot as the IMAP server, this version has remained identical, only SOGo has been updated from 5.9.0 to 5.9.1.

Here is the rule as created by SOGo.
if allof ( not exists ["list-help", "list-unsubscribe", "list-subscribe", "list-owner", "list-post", "list-archive", "list-id", "Mailing -List"], not header :comparator "i;ascii-casemap" :is "Precedence" ["list", "bulk", "junk"], not header :comparator "i;ascii-casemap" :matches "To " "Multiple recipients of", currentdate :value "ge" "date" "2024-01-04", currentdate :value "le" "date" "2024-01-22", anyof ( date :value "ge" :zone "+0100" "date" "time" "17:00:00", date :value "lt" :zone "+0100" "date" "time" "16:00:00" ) ) { if header :matches "Subject" "" { set "subject" "${1}"; } vacation :days 1 :subject "Automatic reply: ${subject}" :addresses ["me@domain.tld"] text:
Here is the text.
.
;
}

For comparison, a rule like the one created by Roundcube with another account (not a SOGo account). From this account the automatic answer is sent.
if allof (currentdate :zone "+0100" :value "ge" "iso8601" "2024-01-04T16:00:00+01:00", currentdate :zone "+0100" :value "le" "iso8601" " 2024-01-22T17:00:00+01:00")
{
vacation :days 1 :addresses "me@otherdomain.tld" :subject "Notice of absence" text:
Here is the text.
.
;
}