Re: Re: detect ISP's legitimate SMTP server

[Ansgar Wiechers <bugtraq () planetcobalt net>]

On 2011-03-09 Vedantam Sekhar wrote:
> one site that gives all this information i know of is www.robtex.com.
> It lists all the MX servers and NS servers for a company. However, no
> gaurentee if that is the SMTP server ISP gives to its customers.
> Chances are that the MX servers we find via dnslookups may be just
> used for that ISP's employees.

MX records only ever specify the servers that *receive* mail for that
particular domain. They don't say anything about relayhosts at all.
Particularly with ISPs it's almost certain that the hosts specified in
the ISPs' MX records are *not* relayhosts.

Regards
Ansgar Wiechers
-- 
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq

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