This email is basically saying that there has been a delay in transmitting the email message. Nothing more.
The code it gives is a 4.1.1 which is a transient error message, meaning that the server will continue to 'retry' the delivery until a certain period of time has elapsed, it should then have successfully delivered the message OR return a Non Delivery Report to the sender.
Where do you connect to to retrieve your email? Verizon directly or do you run an Exchange server?
There is no mention of the reason for this delay, so it could be an internal issue comcast are having, or it may be a problem reaching the Verizon servers. (or Exchange server if you run one).
The key to which one, it whether you have friends using other providers (other than Comcast) that have trouble sending mail.
Shaun