Mail can't connect to Comcast email accounts anymore

I was able to resolve the Comcast mail issue by logging into Comcast email through the web, go to settings (upper right hand side), security, and then click on the box that allows third party apps to access the email account.

One thing that is often overlooked is that when you have a Mail provider like Xfinity, that is also used for TV, Home Phone, Cell Phone, when you think you are changing the password for your TV service(or other), you are also changing the password that Mail uses to retrieve and send emails. If not updated in Mail, then you will not be able to connect to the Xfinity mail server.

Not saying this is the case here, just a reminder for others that come across this situation.

My Comcast email accounts are POP accounts, so I can't confirm the settings. Do you know if they were always IMAP accounts?

Make sure your are using the same login and password that you use to log into www.xfinity.com to view web mail. It looks like a user name or password issue. Is the incoming server imap.comcast.net and outgoing server smtp.comcast.net?

I also have Comcast email, so hopefully I will be able to help. I have not had any problems with Comcast email and I'm on Ventura 13.3.1.

First thing I would do is go to Mail > Window > Connection Doctor. What results do you get?

In addition I would do a Safe Boot to clear up any disk errors, caches, permissions.

Start up your Mac in safe mode - Apple Support

ericesad wrote:

Connection Doctor says, "Trying to log into this IMAP account failed. Verify that the username and password are correct." I'll try a safe re-boot.

contact xfinity support they are better suited to help with your account since they can't verify your username and password.

Thank you! That was it and was so helpful!

You have no idea how awesome you are. I should have entered my question into Google 3 hours ago. I was so frustrated. Truly grateful.

This was the way!!!!!!! Thank you!!

ericesad wrote:

I've checked everything - reset passwords, etc, deleted Comcast account from mail and tried to add it back. It's 3 different Comcast email addresses. They've been working flawlessly for years and I think this all started when I updated to Venture 13.3.1, but I'm not certain of that. Oh - and Mail also stopped working with my gmail account at the same time. Only my apple.com email address works through mail. The other accounts continue to function fine outside of Mail through web browsers.

A good question to ask xfinity support.