I agree with Bob - I don't know exactly how the ISPs do it, but I have
experienced this problem in multiple locations.  It seems to be mostly DSL
services that do it - even the service in some hotels will do this.

With my home ISP (Bell Business DSL) it appears that it is a "learning"
process.  For example, if I go on a trip and have my SMTP server set to
mail.partner400.com I sometimes forget to change it to the ISPs server when
I return home.  However, it will often work for one (or even two) mail
sends - but then I start getting the "relaying not allowed" failure message.
I figured that they must be performing some analysis on the traffic but that
it is not always in real-time.  I have had the same situation occur on a
customer site and in hotels on one or two occasions.

It really does annoy me that they force me to use their server when I'm on
my DSL connection, but won't let me use the same server (even with
authentication) when I'm not on that connection.  Since I travel a lot I am
constantly forced to change the SMTP server settings back and forwards.
Good job it is digital or it would have worn out by now <grin>

Jon Paris
Partner400

www.Partner400.com
www.RPGWorld.com


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