detect ISP's legitimate SMTP server

[Martin T <m4rtntns () gmail com>]

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?


regards,
martin

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