We will continue to support the industry standard port 587. In addition, we are asking email users to migrate to port 465, which offers SSL encryption. In order to ensure a more secure network and email domain, Comcast will no longer by default allow access to port 25 for our residential Internet users. But in this age of bot networks, malware is now responsible for sending the most spam and users are unaware that spam is being sent by their computer.Īs a result, we are updating our management of port 25. This made sense when spam was often sent by an end-user clicking a "send" button. Over the past few years, Comcast has managed port 25 by selectively blocking its use in response to spam complaints. Unfortunately and despite the fact that ISPs like Comcast offer tools to better secure email, many customers using email clients are still sending email using port 25. Many customers also use email clients such as Mozilla Thunderbird or the Apple Mail.app. Over the past few years more and more users access email through our Xfinity Connect site using their web browser. Email is a fundamental part of the way we communicate today, carrying everything from personal day-to-day communications to important financial communications.
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