Mail

If you reset your comcast password you also have to change it on your iPhone. If it is an IMAP account (as opposed to a POP account) the easiest way to do this:

• Go to Settings/Passwords & Accounts, tap on the account and delete it
• Restart your phone —>Restart your iPhone - Apple Support
• Go to Settings/Passwords & Accounts, tap on Add Account and add it back

If it is a POP account you need to Go to Settings/Passwords & Accounts, tap on the account to edit it, and change the password in TWO places, one for incoming mail and one for the Outgoing (SMTP) mail server.

If you reset your password on the Comcast site, you are going to have to change it in your mail settings. I'm guessing that you are getting a password error, or error connecting to the server when you attempt to get mail?