Are you using only the webmail interface and your browser to send, or are you using a desktop client on the laptop, or a mail app on the phone?
I am using the xfinity web site for email on the laptop, and the samsung email app on the galaxy phone
Disable the account on the phone. Does the same thing happen when you try to send from the laptop?
Yes laptop too via the web site xfinity email feature
Did you disable the account on the phone?
@ctorry3, We never heard back from you on here, so I will be locking this thread. Please be sure to reach back out if you still need assistance with this email concern. Please create a new Public post for any new issues or concerns, we're here to help. Thanks and we appreciate you being the best part of Comcast.