postfix/smtpd broken in whisperback.lizard since upgrade to Bullseye
Since the upgrade to Bullseye performed on 2022-02-22, whisperback's postfix is unavailable through the .onion
address:
postfix/smtpd[38008]: fatal: in parameter smtpd_relay_restrictions or
smtpd_recipient_restrictions, specify at least one working instance of:
reject_unauth_destination, defer_unauth_destination, reject, defer,
defer_if_permit or check_relay_domains