Ethical Hacking

Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package.
Computer Forensics Training at InfoSec Institute

Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors.




Network Security Incidents
[Top] [All Lists]

Re: Massive SPAM Increase {-2.6} {-2.6}

Subject: Re: Massive SPAM Increase {-2.6} {-2.6}
Date: Fri, 13 Oct 2006 22:46:34 -0400
On Mon, 09 Oct 2006 13:33:12 CDT, Paul Schmehl said:

(Digging out from a long week of other stuff, sorry for the late response)

Its purpose is to reject *all* mail from bogus MTAs - dialups,
misconifigured servers, MTAs that aren't registered in the domains' DNS as
a "legal" MX, MTAs that don't reverse properly, etc., etc.  If the email is

"mta that aren't registered in the DNS as a "legal" MX" - tell me Paul,
how does that work with any site that's big enough that they run split
inbound MX and outbound servers?

(For example, most outbound mail from AS1312 will appear to arrive from
198.82.162.213 - feel free to let me know what DNS info tells it that it's
a "legal" MX, and/or what's missing/wrong...)


Attachment: pgpJWlqAE0lni.pgp
Description: PGP signature

<Prev in Thread] Current Thread [Next in Thread>