Use $virtual_alias_domains not $virtual_mailbox_domains.

Quoting postconf(5):

    smtpd_reject_unlisted_recipient (default: yes)
        Request that the Postfix SMTP server rejects mail for unknown recipient
        addresses, even when no explicit reject_unlisted_recipient access
        restriction is specified. This prevents the Postfix queue from filling
        up with undeliverable MAILER-DAEMON messages.

        An address is always considered "known" when it matches a virtual(5)
        alias or a canonical(5) mapping.
        […]
        * The recipient domain matches $virtual_alias_domains but the recipient
          is not listed in $virtual_alias_maps.
        * The recipient domain matches $virtual_mailbox_domains but the
          recipient is not listed in $virtual_mailbox_maps, and
          $virtual_mailbox_maps is not null.

Since we alias everything under special, "invalid", domains (mda.f.o and
mailman.f.o), our $virtual_mailbox_maps was null, which led to
reject_unlisted_recipient not being triggered for say, "noone@fripost.org".
However, replacing $virtual_mailbox_domains with $virtual_alias_domains fits
into the second point above.

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