After forced password change, can’t send email, but do receive

I know that (if the Xfinity website allows my most recent password) I can receive email, not sure about sending.  Will test.

OK, just tried to logon with a password that I just reset in the past hour, and the website says it’s wrong.  I’ll change my password again, and login.  Then will try sending.

Ok, Jeff, I had to change my password again - and got onto webmail page.  Successfully received mail, and was able to send an email from the webmail page to my iCloud mail account.

What’s next?

@drb_data thanks for letting me know you were able to update the password on the website and were able to send and receive. With your password now updated, I'd ensure that the information is set up correctly with the 3rd party email client as well. 

Customer's have let me know that at times it may work best to delete, and set up the 3rd party client again. Here is a helpful document that has more on the client set up: https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email

Jeff.  I followed the instructions for apple mail on ipad.  Even deleted the account and set it up again.  Still won’t send email.  Same thing on my iPhone 8.

Anything else to check?

drb_data Hmm, when you set up the account after deleting it fails the setup at the account authentication settings window or it loads and then just will not let you send any email? 

Finally got everything working.  I still don’t really understand what was holding things up…. Turning off my VPN’s was part of it, and finding the correct approach to the apple app configuration was another issue - different for all three of my devices!  

Thanks for your suggestions.  Hope NOT to have to go through this again anytime soon!

Ok, I'm back from my trip.  While I was away from my home internet, I did get all of my devices that accompanied me (iPad, iPhone, and 2025 MacBook air) working, and I can both send and receive mail.  Now that I'm home though, my email files storage is on my iMac.  This does not send or receive.  I've tried deleting the account under system settings, internet account, which DID delete it.  However, when I try to re-add it, with the password that works on all my other devices, it gives me a "unable to verify account name or password" error.  I CAN receive and send email on this account via the web portal, but not in the apple mail app.  I can't seem to get pass the "unable to verify..." error.  My iMac is running Ventura 13.7.8.  The mobile devices are on IOS 26.3.  The MacBook is running Tahoe macOS 26.2.

Even though it's obvious, since the account works on the other three devices, I have double-checked that Xfinity settings allow 3rd party connection.  

I think I've tried every option that I've read about, and can't seem to get this.  I MUST get my iMac connected, but don't want to [Edited: "Language"] up the userid and password that work on the other three devices (you can guess why in reading through the other notes from me here!)

Help?

@drb_data​ Oh, and I have no VPN running on my home machine right now (this has never been an issue in the past..)

Umm... tried the "add accounts" in the sidebar for under "mail".  Simply unchecked the "notes" option for the new account, and everything worked immediately.

On Ventura 13.7.8, where can I verify the ports and server information?  I don't see an obvious place.

Although I can now receive and send, I'm not seeing the read but not filed (ie "inbox") messages that my mobile devices still show....  I'm wondering if I'm really on an imap server...

Ok, I found where to check settings (under "settings / accounts" in the mail app.

All the settings look OK, but I can't see the port number for the imap.comcast.net server....  smtp server is 587