Outgoing email forwarding from internal to external domain
How can I automatically forward outgoing emails to a different domain?
As an example a user sends an email to firstname.lastname@example.org and I want the exact email forwarded outside example.com to email@example.com.
Note There are no accounts on the server under the helpdesk.example.com subdomain and the prefix support-ticket1234 will not be constant, e.g. it might be support-ticket<any number>@helpdesk.example.com
I don't know whether to use postfix transport, procmail or something within zimbra. How do I best achieve this?
Thanks in advance.