5.4.1 Mail rejected by destination domain

Hi,

My colleague ( carol.li@rapala.com.tw) cannot send email to me ( jeremy.grayson@rapalahk.com), she got below return email.

Pls help to fix it

To: carol.li@rapala.com.tw
Subject: Undelivered Mail Returned to Sender

This is the mail system at host ms.rapala.com.tw .

I'm sorry to have to inform you that your message could not be delivered to
one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own
text from the attached returned message.

The mail system

< jeremy.grayson@rapalahk.com >: host mx.zohomail.com [165.254.167. 50] said:
541
5.4.1 Mail rejected by destination domain (in reply to RCPT TO command)

Final-Recipient: rfc822; jeremy.grayson@rapalahk.com
Action: failed
Status: 5.4.1
Remote-MTA: dns; mx.zohomail.com

Diagnostic-Code: smtp; 541 5.4.1 Mail rejected by destination domain