Problem Receiving Emails from some other Domains

Problem Receiving Emails from some other Domains

Hello

my domain ts-vision.com experience some problems I can't understand/
Test emails from Gmail to this domain no problem at all,but from other domains come very late or not at all/

On other side the user gets emails back like 

Delivery is delayed to these recipients or groups:
Subject: test8
This message hasn't been delivered yet. Delivery will continue to be attempted.
The server will keep trying to deliver this message for the next 1 days, 19 hours and 52 minutes. You'll be notified if the message can't be delivered by that time.
What can be here the problem?
Regards Roman Pittroff