If you are unable to send or receive an email, it could be due to several reasons, including network or connectivity issues, exceeded storage limits, incorrect email settings, or blocked or filtered emails. To resolve the issue, you may need to check your email settings, clear cache and cookies, and disable browser extensions or add-ons.
To check for any incoming emails that may have been marked as spam, you should open your Xfinity email account, navigate to the spam folder, and look for any emails that are mistakenly identified as spam. If you find any such emails, mark them as "not spam" to ensure that they go to your inbox in the future.