Duplicated emails

[djabit]

Hi,

does anybody know how to resolve the duplicated e-mail bug? Occurs if an email is send to a normal mailbox with a forwarder to another mailbox.

example:
test1@domain.de is a normal mailbox.
test2@domain.de is a forwarder to test1.
test3@domain.de is a normal mailbox with a forwarder to test1.

One e-mail to test2 --> one e-mail at test1.
One e-mail to test3 --> two e-mails at test1.

Seems that is a known bug... but i did not find any solution.

Thanks.