main.cf:
smtpd_restriction_classes = permit_bad_helo

permit_bad_helo = reject_unauth_destination, permit

smtpd_recipient_restrictions = reject_unknown_recipient_domain,
    check_client_access cdb:/etc/postfix/helo_exceptions.hosts,
    reject_unknown_helo_hostname,
    reject_invalid_helo_hostname,
    reject_non_fqdn_helo_hostname,
    reject_unauth_destination


/etc/postfix/helo_exceptions.hosts:
192.168.3.41    permit_bad_helo