Is it possible to forward mail from one existing mailbox to another? Aliases do not allow mail forwarding from existing mailboxes.
If i create mailbox a@example.com, create mailbox b@example.com and trying to create alias from a@example.com to b@example.com it writes:
“a@example.com is already known as an alias, a mailbox or an alias address expanded from an alias domain.”
Sieve filters are not being suitable for me due to the inconvenience of use