Users can send emails, but can't receive

[clemorphy]

Hello,

I have just installed ispCP on a VPS.
The installation was OK.
I have created a reseller, and then a user with a domain (mydomain.net)

On this domain I have created an email account (myemailaccount@mydomain.net)

With this email account, using the webmail, I can send emails which are successfully received.
But when I try to send emails to this account, for example from gmail, I get an error message from gmail which says :

Quote:Delivery to the following recipient failed permanently:

myemailaccount@mydomain.net

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <myemailaccount@mydomain.net>: Relay access denied (state 14).

Any idea to solve the problem ?