Using the web browser logged into xfinity to my email, I am receiving a timed-out error today. Please advise.

Receiving the following error when I connect to Xfinity email and try to send an email message from my web browser:

Mail server imap-int-east.email.comcast.net unexpectedly closed connection. Please try again later.

Email and setting work fine on my phone app, but I have documents I want to send from computer and web browser with xfinity is how I do this.  Please advise.  I've looked at email settings online and can see nothing to help fix the issue per a web search. 

Thanks!!!