Deliver same E-Mail in same Mailbox only once ?

20 Apr 2016


      Hi there,
I have a customer with domain a@tld and domain b@tld.
b.tld is an alias for a.tld
The Server is using virtual users based on mysql, dovecot for delivery and Maildir for Mail-Storage.
If someone writes an e-mail to a.tld with a cc: to b.tld the customer receives the E-Mail twice.
Is there a way to deliver  the same Mail in the same Mailbox only once ?
--
Christoph Adomeit
GATWORKS GmbH
Reststrauch 191
41199 Moenchengladbach
Sitz: Moenchengladbach
Amtsgericht Moenchengladbach, HRB 6303
Geschaeftsfuehrer:
Christoph Adomeit, Hans Wilhelm Terstappen
Christoph.Adomeit@gatworks.de     Internetloesungen vom Feinsten
Fon. +49 2166 9149-32                      Fax. +49 2166 9149-10