Comcast having a bad day

Comcast announced this morning that they’re having problems receiving mail and their customers are seeing significant delays.
xfinity-logo
We are currently experience an issue which is causing a significant delay in receiving email. This is not a good thing and we are very aware of the problem and are working hard to restore it.
Technical description for those who are interested: 
A problem on a couple of the network switches caused our blob storage to get into a bad state. Lots of peering errors etc, this coupled with a bug in the blob storage vendors software is prolonging resolution. We have an incident bridge going with the team and the developers.
Official notice on Xfinity Forums

They thought they had the problem fixed around midnight, but then…

Update:
We had the problem resolved. We really did. But then… it fought back. The problem is continuing to delay your mail. This is not acceptable to us and we are fighting back even harder to get your mail delivered on time.

The short of it is: Comcast is having major issues today. It’s not you, it’s them.

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How to send better emails: engagement

Today Direct Marketing News hosted a webinar: ISP Mythbusters: How to Send Better Emails. The speakers were Matt Moleski, the Executive Director of Compliance Operations from Comcast and Autumn Tyr-Salvia, the Director Of Standards And Best Practices from Message Systems.
The webinar went through a series of myths. After Autumn introduced the myth, Matt commented on it and explained why the statement was, or was not, a myth. Throughout the webinar, Matt clearly explained what does, and does not, get mail delivered. Don’t let the Comcast after Matt’s name fool you. He is very active in different fora and discusses filtering strategies with experts across the ISP industry. His insight and knowledge is broadly applicable. In fact, many of the things Matt said today were things I’ve heard other ISPs say over and over again.
One of the very first things he said was that ISPs want to deliver mail their customers want. They want to give customers the best inbox experience possible and that means delivering mails customers want and keeping out mails customers don’t. He also pointed out that recipients complain to the ISPs when they lose wanted mail, perhaps even more than they complain about spam.
He also touched on the topic of engagement. His message was that absolutely engagement does matter for inbox delivery and that engagement is going to matter more and more as filtering continues to evolve. There has been some discussion recently about whether or not engagement is an issue, with some people claiming that some ISP representatives said engagement doesn’t matter. The reality is, that engagement does matter and Matt’s words today only reinforce and clarify that message.
Matt did say is that ISPs and senders have a bit of a disconnect when they are speaking about engagement. ISPs look at engagement on the “macro” level. They’re looking to see if users delete a mail without reading it, file it into a folder, mark it spam or mark it not spam. Senders and marketers look at engagement on a much more finite level and look at interactions with the specific emails and links in the email.
When discussing the relationship between senders and ISPs, he pointed out that both senders and ISPs have the same goal: to personalize the customer experience and to give customers a great experience. As part of this, ISPs are mostly aligned when it comes to blocking principles, but each ISP responds slightly differently. ISPs do adhere to best practices for handling incoming email, but those practices are implemented based on the individual company  and handles incoming mail in ways that better supports their company specifically.
Matt talked about Comcast’s Postmaster pages and says they try to give feedback to senders before putting a block in place. He mentions that invalid recipients and poor list hygiene as the fastest way to be blocked or throttled when sending to Comcast. He also said that the core filtering rules at Comcast are static. Changes are mostly “tweaks around the edges.”
During the Q&A portion, Matt took a number of questions from the audience.

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I’m seeing a significant amount of chatter on various lists that queues to Comcast are backing up right now. Looks to be something on their end.
Error messages are 421 “Try again later.” I’ll see if I can find someone at Comcast to give me some info.

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