K bharathan wrote:
it did n't work with changes in mynetworks

if i elaborate the setup, it's like the following:

main external relay -> internal relay(internal-192.168.100.0/24) -> finally mails reach exchange (192.168.100.122)

i want internal relay should not receive any mails other than from external relay

You didn't make the changes suggested.

Add the IP of the external relay to your mynetworks setting.
In your smtpd_recipient_restrictions, replace "reject_unauth_destination" with "reject"

  -- Noel Jones

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