Hi All, One of my user is facing issue sending email to an external domain user. he is getting the below NDR. is anything to look at my end or its an issue at the recipient domain end.
Delivery has failed to these recipients or groups:
A problem occurred during the delivery of this message. Please try to resend the message later.
Diagnostic information for administrators:
Remote Server returned '554 5.4.0'
Your message did not reach some or all of the intended recipients.
Sent: 2/20/2021 08:00 PM
The following recipient(s) cannot be reached:
email@example.com on 2/24/2021 10:13 PM
None of your email accounts could send to this recipient.