This is the Postfix program at host P3-500.open-3d-constructions.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The Postfix program

<damm@localhost.open-3d-constructions.org> (expanded from <damm@localhost>):
   cannot update mailbox /var/mail/damm for user damm. cannot open file:
   Permission denied

Final-Recipient: rfc822; damm@localhost.open-3d-constructions.org
Original-Recipient: rfc822;damm@localhost
Action: failed
Status: 5.2.0
Diagnostic-Code: X-Postfix; cannot update mailbox /var/mail/damm for user damm.
   cannot open file: Permission denied