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Re: detect ISP's legitimate SMTP server
From: James Light <jlight () srcit stevens edu>
Date: Mon, 7 Mar 2011 16:04:22 -0500

On Thu, Mar 03, 2011 at 11:24:15AM +0200, Martin T wrote:
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?



Did you try to query DNS for the mail server?
Set the type of the request to MX.

i.e. to find the hostname of the SMTP server for 'netmeister.org':
$ dig -t MX netmeister.org
$ nslookup -type=MX netmeister.org

If you have 'dig' or 'nslookup' available.


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