Comcast Email just stopped sending/receiving suddenly using Outlook for Mac (with Office 365 Subscription)

@msheldon

Thanks for your reply.  Are you suggesting it might just "fix" by itself?  I've had it 4 days now.  Or is there someplace you know of I can go to "report" this issue or look for a resolution? 

@user_4904c0 I've been trying all sorts of troubleshooting in the effort to resolve this problem including multiple resets of my modem, clearing the IP stack, flushing/re-registering dns info, purging Outlook's roaming/temporary data, checking/repairing Outlook data files, etc.    I noticed last night that several users were reporting error messages with the Xfinity/Comcast SMTP server in that its certification was being rejected.   The moment I should discover a fix for this send/receive problem, I will post it here.

In the meantime, I'm about to make the dreaded call to Xfinity tech support but as so many users have acknowledged, the first line of that support consists mostly of relatively unskilled IT types reading prepared scripts.   If the problem turns out to be their SMTP server's certification, then it will require one of their system admins to fix things.

@msheldon Thank you!  I appreciate your willingness to post anything you learn here.  Good luck in your call to them. I will see if I, too, can "report" the issue to Xfinity/Comcast to add one more customer to drive movement on it. That would be nice if it's as simple as getting an Xfinity system admin to reboot something. 

Hi, @msheldon. Thank you for your feedback on this issue. We would definitely like to look into this further. Could you please send our team a direct message with your full name and full address?

To send a "Peer to peer" ("Private") message:
Click "Sign In" if necessary
• Click the "Peer to peer chat" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window
• Press Enter to send it

the issue is with the "new Outlook for Mac" interface.  I connect fine when using the old version, but when you switch to the new Outlook for Mac it doesn't connect with Comcast email.  I just wasted 45 minutes getting the run around from the hard to understand technical support team - from Tech Support to a Security Specialist back to Tech Support - without getting even an understanding of the problem.

@user_5b48ae​ - Sadly, no. They passed it to their Tech team, which was then escalated to their 2nd tier team, and then last week I finally got an email from an unmonitored email box that said I should speak to Microsoft since the problem is happening with Outlook - totally passed the buck.  They re-sent me the link to an article from 2018 about updating Xfinity email POP port settings (https://business.comcast.com/help-and-support/internet/update-pop3-110-995-business/) that doesn't even address Outlook for Mac, so no help whatsoever. I don't even know who to reach out to at MS - may try researching a little more. If I learn anything, will provide an update here.  If your wife learns anything, I'd appreciate an update as well. Thank you and good luck!

Good morning,

Unfortunately, Comcast does not directly own or manage Outlook and/or Mac. Due to this, Comcast cannot resolve any issues pertaining to them. From what you've explained the issue seems to be exclusive to a single device and the Comcast email service works when accessing via other methods/devices. 

@user_4904c0​ - Thanks will let you know if we find out anything useful.

@XfinityCSAEmail​ - Thank you for the direct explanation. We'll see if we can get an answer through MS. 

@Again​ - Thanks for trying, but we've tried those options, which are over a year old. I'd already made those changes to IMAP and SSL and everything worked fine until just a few weeks ago when they stopped.  Looks like we'll have to try to pursue remedy through Microsoft. Fingers crossed.

Same issue for me with Comcast/Xfinity on outlook windows 10. I receive emails but cannot send starting 4 days ago.  And I had made no changes to outlook. 

I, too, have tried all of the previous post suggestions. No luck. 

Hi! We are sorry to hear that you are experiencing issues accessing your e-mail through a third-party e-mail client. Do you happen to experience any issues when signing in to the Xfinity Connect web portal? 

Hello, no, I experience no issues when signing on directly with xfinity.  It is only when trying to use Outlook. Someone said we'd have to work with Microsoft to address this. 

I am very happy to hear the issue is not occurring when you are signing onto Xfinity. At this point I would reach out to Microsoft Outlook for further assistance, to help determine the issue. We are always here for support should you need us.

Hello @user_bd3d62! Are you also accessing your emails through the 3rd party client Outlook? Have you reached out to Microsoft about this issue? 

@HowdyDoody1​ Yesterday I started having problems downloading my Comcast email into Outlook (Microsoft 365 on MacBook). Got a message my IP had been blacklisted. My first support representative didn't know anything. The second person said they are having a problem with email, but I can't find any status report and my case would be escalated and someone call me.  I am in Hawaii and not on Comcast internet.  Now neither my husband nor I can get our email on our iPhones or iPads. iPhone says "Comcast is currently unavailable."  I even have had intermittent problems today with email on the Xfinity site.  

I will be more than happy to take a look at this for you.

Will you please send our team a direct message with your full name and full address?
~~~~

To send a "Peer to peer" message:
Click "Sign In" if necessary
• Click the "Peer to peer chat" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window
• Press Enter to send it

@Dune21Hello and thank you for taking the time to reach out to us. I want to help get this resolved for you. If you still need assistance, can you please create your own post detailing the issue, so we can help? 

@HowdyDoody1​ where exactly is this box that I can check? to use email with third party program?

just found it under email settings

@user_af1759​ 

Typically Comcast doesn't troubleshoot 3rd party mail clients.

To clarify, these are Comcast email addresses/server, and the error message I was getting was 0x800CCC0E, which basically said "Outlook cannot synchronize subscribed folders for [myEmail]@comcast.net" and "Error: Cannot connect to server"

That never worked for me.  I suspect some of it has to do with my using a VPN, but that shouldn't  cause the problem.  It should simply treat it as though it's a login on a different browser.

Hello @user_a4bf62! Thank you for reaching out on our community forum. We appreciate you letting us know that you've reached out to Microsoft for support and was able to get the issue resolved. Please let us know if you continue to experience any issues.

Hello and how are you doing this afternoon, @satyafrog. It has been a couple of days since you reached out. Are you still having issues, or were you able to get the fixed? 

@user_260491​  - I'm glad that worked for you, it did not work for me.  When I deleted my Comcast account from Outlook and tried to set it up anew, it just gives me the error "Unable to sign in. Check your credentials and try again" and doesn't even allow me to create the account.  Would you mind sharing what set up options you used when re-setting yours up?  I chose New Account, then IMAP/POP for provider (Xfinity is not an option), then Use SSL to connect (Incoming and Outgoing), which changes the Incoming Ports from 110 to 995, and Outgoing ports from 25 to 465. Click "Add Account" and just get the error above.  Are you using other settings that worked for you?  Thanks in advance!

I have gotten the same runaround from Microsoft and Comcast and Apple couldn't help either.  I am getting email  through Outlook on my Mac, but a couple of days ago I started having problems retrieving it on my iPhone AGAIN.  I am now getting " Cannot Get Mail.  Comcast is currently available."   The last time this happened it self-corrected.  I am sure this is a Comcast issue and I'm very frustrated that they won't fix whatever the issue is!

Hello @user_260491. Thank you for taking the time to leave a comment here. I am sorry to read about the email issues! This sounds frustrating for sure. We appreciate you taking and sharing the troubleshooting steps you have. My team can help.

Please send a private message with your first and last name, as well as complete service address to "Xfinity Support". To do so, click on the chat icon located at the top right of this forums page.

1. Click "Sign In" if necessary
2. Click the "Direct Messaging" icon (upper right corner of this page)
3. Click the "New message" (pencil and paper) icon
4. Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list
5. Type your message in the text area near the bottom of the window
6. Press Enter to send your message

I look forward to working with you soon!

Thank you for taking the time to reach out to me, @Dune21. Recently, I was advised that others were also having similar issues with the email. Are you using POP or IMAP? Are you using a VPN or even possibly Norton? |If so, have you tried turning the VPN part off? 

@user_7efc33​ The same fix worked for me. The issue arose when I turned Norton VPN on and went away when Ii turned it off. Wish it hadn't taken me a day to figure it out.

Been having periodic issues with various versions of outlook not working of multiple windows based units.  Had been using Norton VPN all along and no issues until the past few weeks.  Turning off Norton VPN has resolved my issues.  Guess Norton has made some updates outlook doesn't agree with.

Had a conversation with Norton and there fix is to exclude outlook app within the VPN, creating a split tunnel. This will allow the VPN to be on but bypass the outlook app. You can apply this within the Norton app under the VPN

@user_484786​ 

My outlook stopped working a few days ago, I had 3 different email accounts flowing into Outlook. The only way I got Outlook to work was to remove the Comcast.net email account. Have not tried to add it back yet. Works fine on laptop using Big Sur OS.