This isn't possible without separating local mail submission from general > internet incoming mail. > > Probably the easiest way to do that is to require your users to submit mail > on the submission port 587 or smtps port 465, and use your firewall to block > or redirect port 25 from your local network. Then put whatever restrictions > you want on the submission port. > > > > > -- Noel Jones >
Thanks Noel. This answers my question. I was thinking on same lines.
