Dear all,
Could you help me to investigate the issue below which I've been having since yesterday.
One of the users, who works in our company, is trying to recieve an external e-mail, however, for some reason it cannot be delivered to him and a person, who sends the message, receives an error notification below.
However, it looks like no problem occurs with other users who are in the copy
Delivery has failed to these recipients or groups:
Mailbox
A problem occurred during the delivery of this message. Please try to resend the message later.
Diagnostic information for administrators:
Generating server:
mailbox@company.com
# #MAILTO#