From: Alan Becker (beckerasoftrends.com)
Date: Sat Aug 30 2003 - 00:51:14 CDT

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We have some mobile users who travel and wish to maintain a consistent
mail identity. I don't know that any of them have Earthlink, but
whatever they
are doing, other providers can do also; I was using that as an
example. Another class of user for whom this is an issue are those who
are migrating to
various DLS services in preference to dialup access. Many of these also
wish to
have a consistent email identity, as they may DSL at home, but our service
when in the office, etc.

I located an example of setting up Postfix to talk to a different port.
Is it
able to handle multiple ports? If so, it might be possible for clients
to use
the standard port, unless it turns out not to work, and only then get into
changing the port setting in their software? We have found that simpler
is better for customers.
TIA,
Al Becker

Roger B.A. Klorese wrote:

>>A 2nd issue: I have tested this over several dialup links,
>>and so far,
>>it works
>>perfectly except for Earthlink, where it doesn't weem to work
>>at all. From other reading, I am guessing that Earthlink may
>>be filtering/routing
>>smtp traffic
>>in some way. Is it possible to configure Postfix to bind to
>>some port
>>other
>>than 25? Can it bind to multiple ports? Might it be
>>possible to bypass
>>such
>>filtering (if that's what they are doing) by using a
>>non-standard port?
>>
>>
>
>Yes, Earthlink blocks port 25 connections to anything but their own
>servers.
>
>Yes, you can configure Postfix to bind to another port in master.cf.
>
>Yes, for Earthlink users to connect to such an SMTP server might still
>be a violation of Earthlink's ToS.
>
>(If your users are on Earthlink and therefore allowed to relay through
>Earthlink's servers, why not just have them do so?)
>
>
>

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