Yes, good policy. But someone left his/her brains at home or in the trash.

Their announcement states that "Streamyx customers with dynamic IP addresses, who have their own mail server will not be able to send out-going e-mails", but engineer's implemention was "block everything with source AND destination port =25, unless IP address resolves to smtp.streamyx.com / smtp.tm.net.my". Ceh. Seems to me, their policy makers did not clearly define "outbound SMTP" -- whether that means only traffic whose source port =25, or, traffic whose source OR destination port =25. The annoucement should've been more precise.