* Christoph Adomeit <christoph.adom...@gatworks.de> 2016.04.20 10:29:

> Is there a way to deliver  the same Mail in the same Mailbox only once ?

Yes this case is supported via an sieve extension:

require ["duplicate"];


#Deduplicate mails sent to aliases for same mailbox using the msgid

if duplicate {
      discard;
}

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