Stumbled upon a little oddity with SOGo's Vacation rules in that they are appended to the end of the sieve script and end up not processed if a prior rules have stop directives.

For example, I setup a rule to put messages from my gmail account into 'TESTING' and have a Vacation message enabled everything works as expected. If I add a stop directive to the gmail rule the vacation rule does not process.

These rules work in Oder listed:
if anyof (address :contains "from" "joe_user@gmail.com";) {
fileinto "TESTING";
}

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*" ) {vacation :days 7 :addresses ["yacketrj@potsdam.edu";] text:
Testing Vacation rules, please ignore
.
;
}

Jun 3 14:21:52 hermes dovecot: lda(yacketrj): sieve: msgid=<CAD3YU+=TPw8F7OY898vaNcD6rtOWF9L2izC3QV2osxHxm6krrg@mail.gmail.com>: stored mail into mailbox 'TESTING'
Jun 3 14:21:52 hermes dovecot: lda(yacketrj): sieve: msgid=<CAD3YU+=TPw8F7OY898vaNcD6rtOWF9L2izC3QV2osxHxm6krrg@mail.gmail.com>: sent vacation response to <ronald.yacketta@gmail.com>

If I add a stop directive to the gmail check then ONLY the gmail rule is processed

if anyof (address :contains "from" "joe_user@gmail.com";) {
fileinto "TESTING";
stop;
}

Jun 3 14:29:46 hermes dovecot: lda(yacketrj): sieve: msgid=<CAD3YU+mB=Xa6d-bsWC8g62dvp5-2DUNcsNN3Krz9wx_J_Ft8Fg@mail.gmail.com>: stored mail into mailbox 'TESTING'

Other sieve parsers that I have used in the past always placed the Vacation rule at the top of the rule file to ensure it was always processed first.

Will toss a bug/feature in the tracker.