Unable to receive mail on ISPConfig configured email addresses. Just installed ISPConfig 2.2.23, on CentOS 5.1. Everything seems to be working except for email. I created a mailbox "pkp [at ] codecritical [dot] net and can send from the mailbox using RoundCubeWebmail just fine. However when I try sending to it from my gmail, i receive the error Code: Recipient address rejected: User unknown in local recipient table Just out of curiosity i try sending an email to web2_pkp [at] codecritical [dot] net. and receive the error: Code: <email@example.com>: service unavailable. Command output: ==================== QUOTA: 0 INBOXSIZE: 0 Bouncing (inbox already full!) the mailbox has a 50mb limit. Can anyone help me out? The server is on the dmz, and using the ISPConfig firewall. Im getting this server setup so i can move it for colocation at work.