Comcast.net email problems with Outlook

I still have the "unable to receive messages on my Microsoft 365 Outlook application via Xfinity" issue. It plagues both of my computers. I am able to send via STMP but cannot receive via IMAP.  After spending many hours on the phone with Xfinity they actually solved the problem 3 different times this week, but the issue then arose after a few hours. Since Outlook has worked for years, and I have made no changes, I believe the issue lies with the Xfinity server not communicating with my IMAP. I am again waiting for a call-back within 72 hours to solve the problem. 

P.s.: My wife has POP established on her laptop and has no issues. I don't feel comfortable moving to POP since I am unaware of exactly how to do that. 

@user_b9fbc9 Thanks for sharing the email issues here in our community. Please circle back with an update. 

@XfinityChristy​ I appreciate the offer of support.  My understanding was that Xfinity wouldn't be willing to provide support for a problem with MS Outlook.  I'm answering your points belowL

1. Network Configuration: Ensure there are no firewall or security settings on your LAN that might be blocking Outlook’s connection to the email servers.

Outlook is working fine with my domain email; it's only the Comcast.net email addresses that are affected.  Also, the account worked fine for a number of months and then quit working on both my IOS and my Windows 11 machines. However, Outlook works find in other networks on those machines. 

1. IP Restrictions: Sometimes, IP address restrictions or changes in how your network handles email traffic can cause intermittent issues.

Signing into Xfinity.com  to check email works fine from that network.

1. Email Server Settings: Verify that there are no specific settings or filters in your email server configurations that could be causing these disruptions.

The email settings are the standard IMAP settings for Comcast.net, including the inbound/SMTP ports.  

hello, im having a similar issue. my comcast email worked perfectly fine this morning in Outlook (365) and now is having issues. i tried deleting and re-adding the account and now it won't even let me do that. it specifically says "we couldnt log on to the incoming (IMAP) server. please check your email address and password and try again". i literally logged online into that specific comcast email with no issues...

I am having a similar issue of not being able to use <comcast.net> email accounts when I am connected to my home office cable modem using the wired LAN ports.  I am running Windows 11, Outlook 365.  In my case, after getting a new cable modem from Business Comcast the Outlook 365<comcast.net> email accounts get through when I am on the cable modem using wireless 2.4G.  However, using wired lan ports <comcast.net> emails are not working.  What is different from wired versus wireless that would block <comcast.net> emails?  All other apps seem to be functioning properly whether wired or wireless connection used.  Something changed.  Did this issue come with the new cable modem, or was it a coincidence.  I don't have the original cable modem to test, it was returned to comcast.

I switched to Motorola/ASUS router using a different xfinity cable connection.  Same symptoms.  I can send/receive <comcast.net> using wireless 2.4g but cannot send/receive <comcast.net> using wired, so the issue is not due to new comcast busines cable modem.  All other email domains seem to be working wired or wireless.  Any ideas to resolve this issue?

I ran MacBookPro Outlook for Mac connected to Comcast Business cable modem without any issues, wired or wireless. I think this narrows it down to an issue with the Dell machine running W11, Oultook 365.  Strange.

@user_iz83qn Hello and good afternoon. Thanks for adding to the community. We appreciate it, and are happy you thought of us to assist. We have the best tools, just like the Xfinity Assistant. It is the best resource to manage the account and service online. It is my favorite as I can check the service health, and also reboot the wifi for dinner time. That ensures the kids come to eat, and that makes me very happy. Here is a link that I found for you to make it easy to use https://www.xfinity.com/xfinityassistant/. Tell me, when you log in to the Xfinity website to send and receive emails, does it prevent you from sending emails during the same time? 

The website isn't the issue.  It is sending comcast emails through outlook and Thurnderbird on a laptop.  You have killed the outgoing server.  I get emails 24 hours a day.  I can send emails from 6:01 pm to 11:50 am.  When your outgoing server goes off, and the error message says outgoing server temporarily unavailalbe, that is nothing i can do to fix that.  This is a comcast issue.  Likely you meant to turn off the server from midnight to 6 am and got the time zone wrong and turned it off noon to 6 pm, when people  really need to send emails. 

Yesterday i tried to send emails at 5:59 pm.  They would not go.  At 6:00 pm they left the outbox.  Turn the server back on or fix the time out clock on it.

Did that multiple times. Not the solution. Sorry. 

@user_b9fbc9 Are you still having issues with Microsoft 365?