Re: Re: detect ISP's legitimate SMTP server

[Vedantam Sekhar <vedantamsekhar () gmail com>]

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. Usually ISP's configure Relay servers
to serve the customers. Easy way is to call the ISP and get the IP :-)
or run DNS bruteforce and try to resolve their IP space for the PTR
records againest a list of commonly used mail server names (Ex:
smtp.<ISP> or relay.<ISP.domain>..etc).

Thanks,

Sekhar
CISSP,GWAPT,GCIH,CCSA,OSCP

On Tue, Mar 8, 2011 at 6:22 AM,  <Savvy95 () gmail com> wrote:
> As a quick solution, you could install an SMTP server on your machine so you can send email.
>
> Not all email providers accept email from non authenticated servers, but many do.
>
> It's a simple and quick test to find out.  That way you don't have to rely on a 3rd party ISP.
>
> Hope this helps
>
> Glen Victor
> CISSP, CEH, ITIL, MCTIP, MCDBA
>
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------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------