K bharathan wrote:
the following is the log from my gateway to a subdomain; there are lot <> sender mails are going; is it backscatter?; some are rejected on the basis of header-checks; the owner of the subdomain has got a mail server; how can i prevent this
It becomes backscatter if the recipient server rejects the mail and you're stuck with it. So the solution is simple: don't relay mail for someone who doesn't accept all mail from you. Or work with them so that you have the same header checks and other criteria, so that your server will refuse to accept anything that their server will reject.
Still, on their side, if they have a relay in front of them, they should be accepting all mail from the relay and discard stuff they don't want, instead of rejecting it.
--kj
