I Cannot receive email from some domain

I Cannot receive email from some domain

Everything has been good until recently i cannot receive email from a particular domain.

I have sent several support emails and i was ask to send the email header which i did but no one respond to me after that.

I am really worried and devastated, please how can i make my email work, i am really tired that i want to move all emails to Gooogle right now.

Please respond fast