E-mail forwarding is not always that easy. SPF records can be broken, and if an email is lost, it is not easy to debug where it got lost. We therefore recommend not to use e-mail forwarding whenever possible. If you still need a forwarding there are the following possibilities.
As an administrator you can create a Sieve filter. Forwardings created
by Sieve Filters are ARC-signed and the
envelope-from header is rewritten
accordingly. This way, there are fewer problems with SPF.
/mailbox, then Filter
Add a new filter with the following content:
redirect "firstname.lastname@example.org"; discard;
As a user you can create a forwarding with SOGo. Technically, SOGo also uses sieve filters.
/SOGo, then open settings
Click on Mail, then Forward
Create your forwarding here
For creating a forwarding you can also create an alias. However, the envelope-from header will be kept, which may cause problems with SPF. In our case, Postfix cannot perform SRS.