How can I get POPcon to not work with my ISA-Server (proxy) ?
You need to open the IP ports for POP3 and SMTP in your ISA Server. Create two packet filters:
One IP packet filter that allows POP3 accesses with the following settings:
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IP protocoll: TCP
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Direction: Both
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Local port: dynamic
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remote port: fixed, number: 110
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local computer: standard external ip address of the ISA computer
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remote computer: all remote
One IP packet filter that allows SMTP accesses with the following settings:
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IP protocoll: TCP
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Direction: Both
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Local port: dynamic
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remote port: fixed, number: 25
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local computer: standard external ip address of the ISA computer
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remote computer: all remote