RFC 821 states:
=One way to prevent loops in error reporting is to specify a null
=reverse-path in the MAIL command of a notification message. When such
=a message is relayed it is permissible to leave the reverse-path
=null. A MAIL command with a null reverse-path appears as follows:
= MAIL FROM:<>
This form is absolutely legal and your Firewall should let it pass.
Robert
- -
Robert P. MacDonald, Network Engineer
e-Business Infrastructure
G o r d o n F o o d S e r v i c e
Voice: +1.616.261.7987 email: [EMAIL PROTECTED]
>>> "eric clover" <[EMAIL PROTECTED]> 6/5/00 4:12:14 PM >>>
>ok , ill try to redirect this. i Work at an isp. every users at the isp gets
>spam from: <>. we all get the same spam. we get this spam around every 3
>weeks.i am requesting a way to block someone sending a spam from: <> with a
>return address of: <> from ever getting sent to any of our users. procmail
>seems to rate highly with most people, but how does procmail block <> ?
>thank you
>eric
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