If Sieve stuff works, then "vacation" should also work. I have written a
vacation script just yesterday. You should google and checkout some of these
resources:
http://ietfreport.isoc.org/idref/draft-ietf-sieve-vacation/
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# Sieve vacation
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if header "from" :contains [ "MAILER-DAEMON", "LISTM
> All other sieve stuff works fine.
Are you sure it doesn't work? Search the list archives for 'all other
sieve stuff works fine' or something and you'll find lot's of posts. The
usual problem is that people try and try and try but don't realize that
vacation messages are only sent out once per x