Lost Mac Mail receive with Comcast internet

Yesterday I noticed that my iMac mail account was no longer receiving email through my business Comcast internet account. I can send mail through Mail (version 5.2) but not receive. wierd thing is, I can receive mail OK on my mobile devices (iPhone, iPad) while connected to the wireless Comcast. When I use Mail on my home account (non-Comcast) on my MacBook Pro, can send and receive fine.

Are there issues with Comcast someone can point me too?