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https://www.xfinity.com/support/articles/email-errors
Understand email error messages and their codes.
https://forums.xfinity.com/t5/Email-Web-Browsing/Email-messages-not-being-received-by-comcast-customers/td-p/3200884
We are a high school and we send out nightly grade reports to parents, many of which are comcast customers. Sometime in mid December, those messages stopped being received. I have tested and captured packets and have determined that the messages are still being sent and accepted by …
https://login.xfinity.com/login
Get the most out of Xfinity from Comcast by signing in to your account. Enjoy and manage TV, high-speed Internet, phone, and home security services that work seamlessly together — …
https://downdetector.com/status/comcast-xfinity/
Comcast offers cable television, internet and home phone service. Services are branded Xfinity in areas where digital triple play services are available. Xfinity TV offers television over the internet (IPTV). Comcast serves homes and businesses in 40 states and the District of Columbia. Comcast is a majority shareholder of NBC Universal.2/5
https://www.xfinity.com/support/status/
Find outage information for Xfinity Internet, TV, & phone services in your area. Get status information for devices & tips on troubleshooting.
http://postmaster.comcast.net/avoidblocks.html
Comcast consults several DNSBLs including Spamhaus Zen, and ReturnPath. Being listed on any reputable, widely used, DNSBL is likely to cause your email to be blocked not only by Comcast, but other ISPs as well. Keep your distribution lists clean A large number of undeliverable emails sent to Comcast will result in a sending IP being blocked.
https://istheservicedown.com/problems/comcast-xfinity
Comcast Outage Is Comcast having an outage right now? Last Updated 2 minutes ago: Comcast is an American telecommunications company that offers cable television, internet, telephone and wireless services to consumer under the Xfinity brand. These offerings …
https://forums.businesshelp.comcast.com/t5/Domain-Names-Static-IP/Comcast-Mail-Delaying-amp-Failing-Delivery/td-p/33456
Nov 25, 2017 · I need some help. My exchange server, which has been sitting behind the same block of Comcast IP Addresses for almost 5 years, are now not delivering messages to @comcast.net addresses. I get the dreaded Delivery Delayed followed by it eventually not delivering. I have verified I …
http://postmaster.comcast.net/feedback-loop.html
Feedback Loop Policy This page is intended to provide information about Comcast's feedback loop program How to join and how the information can benefit senders. Feedback loop data is generated by user complaints as they make use of the "This is Spam" reporting mechanism.
https://community.constantcontact.com/t5/Get-Help/Emails-not-making-it-to-Comcast-addresses/td-p/276910
Another reason to be suspicious is that I've gotten no opens yet from Comcast addresses on a campaign that went out yesterday evening. True, those addresses comprise only five percent of the total, but combined with the fact that I never got those test emails at my Comcast accounts, it …
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