Unable to receive and send specific emails

Unable to receive and send specific emails

Hi, 
 
I have a persistent problem, that i felt needs addressing. 
 
I'm often unable to send emails to some mail providers, which are then returned to me (  printscreen_ 1 ; attachment zoho_mail3), and I'm also unable to receive some emails, like the one in  printscreen2 (attachment: zoho_mail2) . Both problems are not present with my  gmail  account if that is of any use to you

Printscreen_1


Printscreen_2 (from my Gmail account, never received on my zoho account)