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. 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.