-=item dest - Invoice destination: If numeric, a svcnum (see L<FS::svc_acct>), if string, a literal email address, or `POST' to enable mailing (the default if no cust_main_invoice records exist)
+=item dest - Invoice destination: If numeric, a svcnum (see L<FS::svc_acct>), if string, a literal email address, `POST' to enable mailing (the default if no cust_main_invoice records exist), or `FAX' to enable faxing via a HylaFAX server.