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Jump to PostMick,
Are you running McAfee? The basic installation of McAfee blocks port 25 by default. You can disable this in the console under access protection the top check box.One way you can rule out your ISP is by using another email application like quick mailer
Jump to Postthink ISP is at fault
if so ,did you phone them to help you with it !! its usually a free call.
also please tell us what program you are trying to use to send and receive the emails .
Jump to PostITS ONE OF 2 THINGS
1 your out going server might be typed incorrectly double check the setting2 if thats correct you are blacklisted by your isp probably from sending too many emails in a given time period that will look at it as spam and block you.
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