Re: detect ISP's legitimate SMTP server

["RPLists" <lists () reversepath net>]

> I was abroad in Germany with my Nokia n900 and I needed to send few
> emails over the HSDPA connection. The problem was, that I had no idea
> about ISP's SMTP server and the one I use in my country did not
> work(most likely ISP allows to use only the legitimate ones). I
> detected the ISP using the IP address and whois information about it
> and finally gave them a call. However, is there some sort of smart way
> to detect legitimate SMTP servers in ISP network?

Martin,

Some ISPs may not allow you to use their outgoing SMTP server unless you
are a customer of said ISP. These days, ISPs should implement SMTP AUTH or
TLS etc.. however, that is beyond the scope of what you are requesting.

Provided you have a unix/linux box available to you, you can issue 'dig -x
a.b.c.d' to find the reverse DNS record for the IP. This will give you the
host and domain name associated with the IP (if the the in-addr.arpa
record is present). If you already have the information via WHOIS you may
have domain name information handy. You can look up the mail exchangers or
SMTP servers using 'dig MX domain.com @<dns.server>'  or even try to query
dig smtp.domain.com.

You can even issue nslookup commands from a DOS command prompt and do
nearly the same thing.

If you do not have access to a unix/linux box or windows DOS prompt you
can use the "Domain Dossier" at centralops.net (http://centralops.net/)
and it will spit any useful information out for you.

hth

--elm


------------------------------------------------------------------------
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
------------------------------------------------------------------------