Originally Posted by till
ISPConfig does not have this option. But you can e.g. rename the mailbox adn then add an alias for the original email address to the mailbox and a new forward for the external recipient.
Not an Elagant solution,
The Client's want to collect mail on the mailbox but also want it forwarded to other mailboxes like an Central Backup Mailbox collecting ALL mail. I could therefore add an forwarder to all mailboxes that collect mail to firstname.lastname@example.org
and keep original.
In South Africa it is Required to keep mail for some years and by collecting it in one central mailbox we only need to download and save that one.
ISPC 2 did this perfectly