If you are also facing the comcast email issue where you cannot receive any emails on your comcast email account, then you should always check the below things before blaming the comcast in different forums. Sometimes the issue can be from our side and we just keep trying to contact the customer support of the webmail service provider. 
1) Always check that you have not blocked any of your contact in the comcast blocked lisy.
2) Check your spam folder once, because sometimes important mails lands to the Spambox because of links or malware attachments.
3) Sometimes, the antivirus firewall stops the malcious mails to land on your Comcast account, so try to disable the firewall and try your email account.

Ref: https://emailscrunch.com/comcast-email-not-sending-and-receiving/