[RE: educating rDNS violators]

From: Pat Moffitt (pmoffitt_at_wrv.com)
Date: 09/23/04

  • Next message: Alex Frias: "Re: How to Enforce Complex Password Policy for Selected Users Only" 
    Date: Thu, 23 Sep 2004 14:19:01 -0700
To: security-basics@securityfocus.com

    I am not attempting to verify the HELO Command. I am attempting to verify the
    IP Address of the system that is trying to make the SMTP connection. As such,
    this section of the RFC does not apply. I see nothing in this RFC that applies
    to using RDNS to reject mail connections, only on using RDNS to verify HELO
    commands.

    Pat Moffitt
    MIS Administrator
    Western Recreational Vehicles, Inc.

    -------- Original Message --------
    Subject: RE: educating rDNS violators
    Date: Tue, 31 Aug 2004 13:35:34 -0400
    From: LordInfidel@directionweb.com
    To: 'Derek Schaible' <dschaible@cssiinc.com>, Niek <niek@packetstorm.nu>
    CC: security-basics@securityfocus.com

    [snip - to supply the relevent part of the message]

    6. Section 5.2.5 of rfc1123 covers this quite explicitly. Rejecting mail
    based on RDNS ~~~***VIOLATES***~~~ the RFC:
    http://www.faqs.org/rfcs/rfc1123.html

    5.2.5 HELO Command: RFC-821 Section 3.5

    [snip]

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