I am unable to send or receive emails from domain @artleaguehhi.org
I am unable to send or receive emails from my local art league. The domain is @artleaguehhi.org The last email I can find is from 1/29/2018. They are not getting an error when sending and neither am I. My Junk and Spam folders are empty. They are not receiving the emails I send. Where else should I look? this does not appear to be impacting send/receive to other domains that I know of.