Delivery to the following recipients was aborted

Receive from Exchange after I send an email to edited recipeint:  (xxx@yyy.com.pl).  

From: Mail Delivery System [mailto:mail-daemon@comcast.net]
Sent: Friday, July 15, 2016 7:57 AM
To: Stephen, Engel
Subject: Delivery status notification

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients was aborted after 9 second(s):

* xxx@yyy.com.pl

I want to send email to Poland and to email extensions of .com.pl and .pl

is my problem at the exchange level ? How do I fix this?  Thank you.

Stephen Engel

916-362-8329

sengel@cybrk.com