If by sending an e-mail from a domain account you receive the error: Sorry, no mailbox here by that name. vpopmail (#5.1.1)

Hi. This is the qmail-send program at mxN.aruba.it.
I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out.
 
<
accountname@domainname.xxx>:
Sorry, no mailbox here by that name. vpopmail (#5.1.1)

The entered account does not exist. In order to create it you need to access the Mail Admin Panel, as shown in “How to create the domain e-mail accounts”.