I can understand why the Malaysian ISPs did that.  Spams was reaching crazy levels, too many personal computers were attacked and turned to trojan spam machines.   This in turn caused a lot of Malaysian IPs to be blocked.  By taking this drastic measures it will help curtail the spam issues.  One big problem however is the inconvenience of users who are using other SMTPs.   It seemed that they will have to use the Malaysian ISP’s SMTP which is surely unblock for the users.

For this who had faced this problem, call up your ISP and enquire them about what to put for the Outgoing SMTP server.   Put this in and it should be ok.