It depends on the mailbox type:
SMTP mailboxes forward to your Maildoso Master Inbox (
@maildoso.email) only — not to an external address.Google Workspace mailboxes forward to an external address (any non-Maildoso mailbox), set via Bulk Actions → Change Forwarding Address.
To get everything into your personal Gmail/Outlook: connect your Master Inbox in Outlook and add a rule that forwards incoming mail to your personal address — see Using your Master Inbox and connecting mailboxes to an email app for how to connect it. If those forwards land in spam in Gmail, add the Master Inbox address to your allow-list and mark "Not spam."
More detail: Forwarding Addresses / Master Inbox.