implementing SPF, which milter?

Lars Kristiansen lars+lister.mailscanner at
Fri Mar 2 04:07:46 CET 2007

> I had to disable SPF for one of our customers as they had users 
> travelling in europe and middle east and were forced to use the ISP's 
> SMTP server.
> Anyone in Europe can verify or explain?

Some providers block port 25 as a way to fight spam from botnets within.
You might think of port 25 as for communications between mailservers.
Port 587 is the correct port for mail submission from clients.
This is best solved by configuring your mailservers for mailsubmission 
for authenticated clients on port 587.

  from Lars

And all the best to Julian.

> --
> Michael Choo
> ACTC, APP 2006

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