Have you already checked Comcast's website for their mobile email server settings?
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
I know email is an important form of communication and I would love to help! Please try incoming server settings: mail.comcast.net , port: 110, security: none and outgoing server settings:
smtp.comcast.net , port: 25, security: none. If you are still unsuccessful please contact Comcast as suggested by Ann154. Thank you! ^TB