How to set forwarding addresses/ Master inbox on my mailboxes?

You can simply select the mailboxes by clicking the leftmost blankbox (select top box for all mailboxes) and once mailboxes are selected please click “change forwarding address” that pops up on top-left. Here you can set up the master inbox you want the mailboxes to forward too.

Unfortunately we have deactivated the ability to use any forwarding address other than the maildoso.email as there are some difficulties with non-maildoso forwarding addresses over which we don’t have control yet.