On 3/14/2013 9:20 PM, Les Mikesell wrote:
Some ISP's block port 25 if it is a 'home' type connection. Comcast recently started blocking and I can't connect there from home either.
configure your mail server to use your ISP's mail server as a 'smarthost', OR configure it to use an external (coloc or whatever) server as smarthost via port 587 with authentication.