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Unable to send emails through outlook .. ISA blocking port 587

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Hello All, 

I am sending this message after searching every possibility through google but haven't figure out the problem. 

I have ISA server 2006 installed with service pack 1 and its already updated. I am using Edge template to configure network settings. In our area ISP has blocked smpt port 25 due to spams going through that. So we only have let with two ports i.e. 587 or 465 with ssl. I wan to let my windows 2003 server domain users to use port 587 for sending their emails trough outlook. Please note that our exchange server is situated in USA (we are in Pakistan) and through a client computer and through ISA i am able to ping that. Also i have configured DNS as first policy then SMTP, SMTPS as secnond and HTTP & HTTP as third and then the default deny policy. Please also note that through smtp port 465 (SSL) works fine but don't now about the CA. 

I noticed in the loging activity that 587 port denies by the ISA with a message that un identified traffic. I have also configured TMG on my network and the same issue occurs. 

Could any buddy please help? 

Regards, 

Abdul Ghaffar


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