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Old 6th October 2011 | 17:56
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Airborne Aircrew
 
Joined: Jun 2007
Posts: 1,460
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From: Detroit MI
It is possible that 3 and 4 are blocking port 25, (SMTP), which is what outgoing mail uses to prevent spambots. In general administrators will configure their firewalls to only allow bone fide mail servers to use SMTP on port 25.
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