Looks like the new version of email has a few bugs in it. For some reason all my read email is deleted after it is read and it's no where to be found -- it's not in the trash folder -- it's just gone after I read it.
How does this happen? Are there settings to keep read email?
How are you accessing your email? On a desktop or laptop using a browser and the webmail? Or on a mobile device with a mail app? Have you tried running a search for the emails in question?
Is it possible that in Settings, you have 'Auto Forward' turned on and 'Save a copy of forwarded emails' off?
Ignore that....if you're able to 'read' it then auto forward is OFF. Sorry. In the (website browser email) Settings, I don't see anywhere where there's an option to delete after reading.
There is, in Advanced Settings, the 'POP Settings for Other Apps'. If you have another app somewhere accessing your Comcast email then:
Anyone??? Tech support has not resolved. It happens on 3 different desktop computers. Happens with Firefox, IE and MS Edge browers.
The only other thing I can think of is if you have the account enabled in a desktop email client like Outlook or Thunderbird, or in the mail app on a phone or tablet using POP3. If that is the case, POP by default will download the messages when you check your email, then delete them from the server.
It looks like you have your sort set to unread in webmail. Once you read an email it will automatically move to the unread section. To change this click on sort in the right-hand corner above your mail list. You can then sort it by date which is the default method.