On 07/17/2012 09:14 AM, Dan McAllister wrote:
Many "residential" ISP services (particularly those from AT&T and Verizon) block outbound activity on port 25 in an attempt to combat SPAM (and to block "infected" systems from sending massive amounts of e-mail that way).
Some (Cox cable and CenturyLink DSL) block port 25 inbound as well as outbound. This is typically only on dynamic IP accounts. If you have a static IP address and port 25 is blocked, contact your ISP to have them unblock it.
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