Support XFINITY Internet What is Comcast Doing About Spam?


We take our responsibility to combat spam seriously and we constantly work to reduce the amount of unwanted and malicious emails that make their way to our customers’ inboxes. We employ a number of technologies to reduce spam including:

Protecting Email

Reputation Services – We use various reputation services, including products from Spamhaus, Return Path, and Cloudmark, to help determine the likelihood that a source of email is identified as sending spam. These services include traditional blacklists, which evaluate key indicators and patterns using industry standard metrics and sources, to block senders from sending spam both into the Comcast email domain (inbound) and from that domain (outbound).

Automated Spam Filtering – We use Cloudmark Authority to filter inbound and outbound email. Cloudmark Authority relies on a global network of reliable feedback and reputation data in order to filter spam, phishing and malware.

Automated Malware Filtering – We use TrendMicro’s VASPI for virus and malware filtering on all email. In addition, we protect our customers by prohibiting the delivery of emails containing file attachments that are most often used to transmit viruses. These file types include: .vbs, .pif, .scr, .bat, .com, .cmd, .msi, and .reg.

NCMEC Filtering – We employ a list of links of verified child exploitation materials prepared by the National Center for Missing and Exploited Children (NCMEC) to ensure any emails containing links to this illegal content are not transmitted through Comcast email for both inbound and outbound email.

Require Encrypted and Authenticated Ports to Send Email – We require all customers using email clients, such as Outlook, Thunderbird, or Mac Mail, to configure their software to use authentication and encrypted ports to send and receive email. This helps ensure that Comcast email users have a safe and secure experience.

Educating Customers

The Comcast Constant Guard Center is a comprehensive and expanding place for our customers to learn about security for their home computers and network. The site offers a number of useful tips and software including:

Stay Active in the Industry

Comcast actively participates in several industry associations that work to reduce spam across the Internet and improve the end user-experience. These include, but are not limited to:

  • M3AAWG
  • Anti-Phishing Working Group (APWG)
  • Internet Engineering Task Force (IETF)

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