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Does the outbound blocking of port 25 mean that Cox customers have to use their @cox.net email addresses for everything they send?

April 26, 2017addresses blocking Cox customers email mean outbound port

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Does the outbound blocking of port 25 mean that Cox customers have to use their @cox.net email addresses for everything they send?

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No. Customers can use any valid email address, but the email sent from their Cox High Speed Internet connection must be routed through a Cox SMTP server.