Can't send, only receive email

Can't send, only receive email

Hi, I can't receive email to zoho. Domain is setup through Namecheap, under mattgsellslv.com.

I checked on MXtoolbox, and got some errors, one says I'm on a blacklist? 

I can get email from my @cox email, but I can't send to it. One made it through when I started this morning. Thanks.