Prejudice, or a problem with the SMTP mail
NethServer server or domain example: pippo.it
When sending a mail to a person who is not registered on NethServer but uses it externally from the remote server does not NethServer gives me the following error:
(There was an error when sending mail. The mail server responded:
5.1.1 email@example.com: Recipient address rejected: User unknown in virtual mailbox table.
Check the message recipient "firstname.lastname@example.org" and try again.)
How can I do to solve this problem and send mail to the person who is not connected to the server and connected to the server but NethServer Remote.