Email Account Error - Temporarily Blacklisted IP address

I'm having intermittent email account errors when accessing my Xfinity account from my second home.  I'm using Apple Mail on a Macbook air using wifi connected to the interet.  I have full access to the internet, but when my Mail app attempts to connect to my Comcast mail server, I get the message: Online Status - Temporarily blacklisted IP address - try again later.  Some emails will come through periodically, but in general there is no email access through the wifi router.  I am able to access email on the Macbook when I use a cellular connection via my phones hotspot function.

Any ideas how to keep my wifi IP address from being blacklisted by Comcast?

Thanks in advance.

Rich