"The mail draft could not be found on the server. It was sent or deleted in the meantime.

I'm using Xfinity email - no other platform. 

You mentioned that you would compose the message on Word then cut and paste. What happens if you compose the message instead of cutting and pasting from a different software?

The problem happens when I'm trying to compose the message in Xfinity email - not when I do the cut & paste from Word. The message does not go into drafts or anywhere else. The error message comes up & the email I'm composing is lost. This is a problem with Xfinity email. If you google the error message, it's been happening for several years. It just started happening to me a few months ago. I've been with Xfinity/Comcast for 20+ years.

@thefulls, The information I'm finding on this is that if you are getting this kind of error message, it could be due to various reasons. One possibility is that a virus or worm may have infected your system or a friend's system, causing email issues. Another reason could be that your email server has been blocked by Comcast due to sending patterns characteristic of spam. To resolve this, ensure your antivirus software is up-to-date, and contact Customer Security Assurance for assistance. Here is that link: internetsecurity.xfinity.com/help/report-abuse

@user_z62jj1 What web browser are you attempting to access the connect portal from? Have you tried clearing your browser's cache and cookies only to experience the same issue? Is the issue happening on different browsers?