Need Solve this errors

[M Sheraz Iub 0]

AOA 
I need help related to email sending error outlook 2016
from IT Department Networking
This message occurs from all emails

This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: <Removed email address and IP> SMTP error from remote mail server after end of data: 550 Action not taken

If you have any solution about these errors please solve 

[Nick H. 9,195]

5 hours ago, M Sheraz Iub said:

If you have any solution about these errors please solve 

The error message is telling you that the email address doesn't exist. There's no real solution to this problem, you need to contact the person via another means and confirm that you are writing the correct email address. Also, talk to your IT department who would be able to provide a more detailed log of what is going wrong.