How about this legitimate reason.
I work for a hosting comapany for small/medium sized business, one of the services we offer is coporate email.
Last week we got a flood of calls from Sales people on the road or people trying to send mail from their coporate accounts from home, they couldn't anymore.
Turns out the largest ISP (and telco) in my area implemented this port 25 policy for all PPPoE customers, residential and business.
So, my company can no longer offer email to users on this ISP's network (that'll change, we're looking into legal recourse now).
This won't slow spam down on this particular network, because they still allow anonymous mail relay.
All it does is force our customers to switch to another service, which is illegal here in Canada.
Slashdot Mirror
How about this legitimate reason. I work for a hosting comapany for small/medium sized business, one of the services we offer is coporate email. Last week we got a flood of calls from Sales people on the road or people trying to send mail from their coporate accounts from home, they couldn't anymore. Turns out the largest ISP (and telco) in my area implemented this port 25 policy for all PPPoE customers, residential and business. So, my company can no longer offer email to users on this ISP's network (that'll change, we're looking into legal recourse now). This won't slow spam down on this particular network, because they still allow anonymous mail relay. All it does is force our customers to switch to another service, which is illegal here in Canada.