U

Visitor

 • 

8 Messages

Wed, Jan 5, 2022 5:11 PM

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

I use MS Outlook for Mac v 16.56 (21121100) with a MS 365 Subscription license. Two days ago I abruptly stopped receiving Comcast emails and could not send any either (they just sit in outbox). When I try to send/receive, I get an Outlook message that says: "Mail could not be received at this time.  The server for account <my account> returned the error "[AUTHENTICATIONFAILED] authentication failed.." and then it asks if I want to try re-entering my password, if I say yes and enter my password (which is correct) it just gives me the same message. I haven't changed my settings but my email account went from showing a green dot to a yellow dot.

I've researched the various threads and tried following the different instructions with different settings (incoming server imap.comcast.net and mail.comcast.net), different ports (993, 587, etc.). I've tried creating it as a new account in Outlook (IMAP/POP option), enter all the correct info, tried the various incoming servers (map.comcast.net, mail.comcast.net), used the different combos of ports suggested in various threads (993, 465; 993, 567 etc.) and I get the error "Unable to sign in. Check your credentials and try again." My password is correct. So can't create it anew in Outlook.  I can still send/receive my emails on my iPhone, and via the Mail program on my Mac (macOS Big Sur v11.6).  I don't use Norton.

Has anyone else had this happen? Any suggestions or can you point me in a direction with accurate instructions? (The xfinity link that provides instructions for the various 3rd party email clients doesn't list Outlook for Mac and when I use the "other client" settings I get the error above).  Any help is appreciated - thank you in advance!

msheldon

Contributor

 • 

37 Messages

6分前

Same issue here.    In the last 24 hours numerous users have reported Outlook-related problems dealing with both server and certificate revocation issues.   I also had a network outage yesterday afternoon for the better part of 20 minutes.

Visitor

 • 

8 Messages

@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? 

msheldon

Contributor

 • 

37 Messages

@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.

Visitor

 • 

8 Messages

@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. 

Official Employee

 • 

320 Messages

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

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
lrez57

Contributor

 • 

13 Messages

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.

Visitor

 • 

2 Messages

5分前

My wife also started having this problem two days ago on her Mac w/Outlook.  She can log on to her Comcast email fine from her IPhone and the Xfinity web site.  Trying from her Mac however she gets a message that her password is not correct.  Have you managed to get any resolution to the problem?

Thanks for any help.

Visitor

 • 

8 Messages

@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!

Official Employee

 • 

888 Messages

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. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Visitor

 • 

2 Messages

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

Visitor

 • 

8 Messages

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

Again

Expert

 • 

27.5K Messages

5分前

@user_4904c0 

Please check this post to see if it applies to you.

Visitor

 • 

8 Messages

@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.

New Poster

 • 

4 Messages

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. 

Official Employee

 • 

233 Messages

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? 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Visitor

 • 

8 Messages

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. 

Official Employee

 • 

146 Messages

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.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Visitor

 • 

1 Message

4分前

HELP! Same issue here. I am on my third day of not receiving emails to my Comcast.net account. I can send emails, but can't receive any. UGHHHHH

I have exhausted all troubleshooting and talked with support. They have no idea what the issue is.

Official Employee

 • 

628 Messages

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

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

New Poster

 • 

3 Messages

4分前

I've been having what I believe are authentication errors using the Outlook app on a Win 10 PC and Samsung Galaxy phone and tablet , off and on, for some time.  I frequently am asked, in the last week or two, several times a day, for my password which, though entered correctly, fails to satisfy Outlook.  Comcast instituted 2-step verification as a security measure, which I very much appreciate.  I suspect this is the disconnect, but neither Microsoft Outlook nor Comcast acknowledges that they can do anything.  I want to continue using Outlook as my email client, but if you two can't come together and figure out how the server handshake needs to happen, I will have to ditch it.

Visitor

 • 

1 Message

4分前

I have a secondary email address that I use and have been using for some time that works with my Mac Mail account. I deleted my previous main email address and added an existing secondary email address as my primary. I works just fine on the website, but doesn't work with my Mac Mail account. I have checked the box on using my email with a third party mail program. I am a retired Comcast tech and am quite frustrated with the inability to get to any level of service that is not canned. I started work before Comcast bought the service and am sad to see it deteriorate.

New Poster

 • 

8 Messages

@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.  

Official Employee

 • 

349 Messages

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

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
XfinityAbbie

Official Employee

 • 

985 Messages

@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? 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Frequent Visitor

 • 

7 Messages

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

Frequent Visitor

 • 

7 Messages

just found it under email settings

Visitor

 • 

1 Message

3分前

I use Outlook with Windows 10 and have the same problem. I spent a lot of time Thursday and Friday with Comcast. On chat and in person and then they said it wasn't there problem, someone for Outlook would contact me. No sure I believe that. In the mean time I can login to Comcast but would rather it was in my Outlook. 

Visitor

 • 

1 Message

3分前

This started happening to me 3 days ago. Thought I needed to change from POP to IMAP but based on all the previous posts that doesn't help. I also updated to Outlook 365 (PC) thinking that would help. Checked all the settings based on everything that's currently on the Comcast site and everything matched up. The emails are coming through on Comcast's site, so why the sudden disconnect between Comcast and Office? Just added another comcast account on iPhone and that works. Look forward to hearing any new updates. In the meantime will continue to ask Comcast to resolve this issue. Thanks everyone, glad its not just me.

Again

Expert

 • 

27.5K Messages

@user_af1759​ 

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

See if this post solves the problem for you. 

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

Visitor

 • 

2 Messages

2分前

My emails stopped downloading to Outlook 4 days ago, but I could still access them using my android phone. Since I read here that it was therefore an Outlook problem, I called Microsoft support.

Here is the solution that MS tech support came up with that worked to fix it:
--> Erase and re-enter the password under the settings for the email account.

They navigated me to my outlook settings for each comcast email account (sorry, don't remember how I got there), where password was shown as dots to hide what it is. Then they told me to erase the saved password in the text box, and to re-enter the exact same password that I knew it to be. That's all. I did not have to change the password from what it was, just basically erase it and re-type it in.

I don't know why that would work (got corrupted somehow?), but it did. Easy fix, hope it works for you!

Visitor

 • 

2 Messages

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"

New Poster

 • 

3 Messages

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.

Official Employee

 • 

267 Messages

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.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
XfinityAaron

Official Employee

 • 

644 Messages

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? 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Visitor

 • 

2 Messages

1分前

The issue of the Comcast email address is not limited to Mac and Outlook 365.  I am using Outlook on  Windows 10 and it just stopped working .  I got a popup asking for my account name and password.  I can access my email accountant and send and received through the Xfinity site . That works fine but Outlook is the issue.  I had a Geek Squad tech work on this for hours with no success. I also called Microsoft support for Outlook. Both the Geek Squad Tech and the Micro soft tech said this is an issue with Comcast.  I called your tech support and not only could they not help they told me to contact Microsoft / Outlook.  This after I told him I already had they said was an issue with Comcast server blocking access.  It is not just with one computer.  I have two computers that it occurring and on two i Phones.  The weird thing about it is when I deleted the Comcast email from  Outlook and set it up again it worked however only for two days and same thing started happen all over again.     

Visitor

 • 

8 Messages

@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!

New Poster

 • 

8 Messages

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!

Official Employee

 • 

515 Messages

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!

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Official Employee

 • 

349 Messages

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? 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Visitor

 • 

1 Message

1分前

I found a fix!  I started having the same problem receiving email using Outlook in Windows 10.  I was constantly asked for my password but the correct password didn't work.  Outgoing mail worked, other email accounts worked and my Comcast email could be received on my laptop and phone using the same settings - I use POP not IMAP.

My fix was nothing to do with Comcast or Outlook.  I was using a VPN through Norton.  I turned it off and incoming Comcast mail showed up in my Inbox.  If you don't use Norton or a VPN then I can't offer any suggestions - I'm just telling you what worked for me.

forum icon

New to the Community?

Start Here