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Nils Puhlmann <npuhlmann@???>
- Certified Information Systems Security Professional (CISSP),
Certified Novell Instructor (CNI), Microsoft Certified Trainer (MCT),
Netscape/Iplanet Solution Expert, Cisco Certified Network Associate (CCNA),
Check Point Certified Security Engineer (CCSE Firewall-1) -
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>"Nils Puhlmann" wrote, Friday, November 21, 2003 10:13 AM
>
>> I have a question in regards to the RFC 2821 compliance of Exim.
>> It seems that Exim blocks messages with an empty return-path.
>> For example this from the error log:
>> F=<> rejected after DATA: syntax error in 'From:' header
>> >when scanning for sender: missing or malformed local part in "" AV
>> >Service" <>"
>> >Envelope-from: <>
>> But RFC 2821 says explicitly in chapter 3.7 relaying:
>[snip discussion of null envelope sender]
>> So now I wonder if Exim really is RFC compliant in this regard or not?
>
>It is. An empty return path is:
>
> MAIL FROM: <>
>
>which is perfectly valid. What Exim is objecting to is:
>
> From: "AV Service" <>
>
>which is *not* valid, since `<>' is not a valid local part. The envelope
>sender should be <>, but the `From' header should contain a real e-mail
>address (usually something like Mailer-Daemon@domain).
>
>Adam
>
>
>--
>
>## List details at http://www.exim.org/mailman/listinfo/exim-users Exim details at http://www.exim.org/ ##
>
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