> >i'm not relaying through so don't understand
> 
> ORBS has a database of open mail relays that some ISPs use to keep out spam.
> Maybe your mail server is not configured properly, so outside users can send
> email through that server?  Remedy is for the administrators to correct the
no - it's my home sendmail configured not to do it.
> software so that outside users are barred from sending email through the server.