implementing SPF, which milter?

[Chris Yuzik]

Michael Choo wrote:
> 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?
Michael,

Here in Canada, a number of ISPs (for example, Telus), including cable 
and DSL, block outbound access on port 25. They do seem to allow 
outbound access on port 587 though. Additionally, with some fancy 
footwork with iptables, you can configure a port-forward from some 
unused port to port 25 which we do as a backup just in case port 587 
isn't available either.

Chris