Gsuite Cannot Send to @Comcast.net

My office is having an issue with comcast.net recipients not receiving emails sent from our Gsuite @davidbrentonsteam.com or @move2indy.com accounts.  The recipients at my request have checked spam and trash, and they are not there.  This even applies to their messages I reply to. The messages just disappear! There is no error message, and we do not know it has not gone through until we confirm the email or ask why we did not get a response. 

This is costing us valuable business and is making our company appear unprofessional. Please help. Our IP Address is 50.195.157.5

Thank you!