Broadband ISP acting smart?

According to a post on Jason’s blog (welcome to the blogosphere by the way!) Irish ISP Smart Telecom have decided to block port 25.
It seems that the new policy affects all customers unless they have a static IP and specifically request that the restriction be lifted.
It’s an interesting and quite brave move for an Irish ISP to make and probably won’t be the last one.
From the point of view of hosting providers this could hail a “sea change” with regard to SMTP usage and access, as clients will be forced to use their ISP’s outbound mail server.
While this may cause issues for “domestic” subscribers it probably won’t have any serious long-term effects on business users.
EDIT: Wrong link! Well spotted