hello. I'm having again this problem, but just with one user (I have hundreds of users created and anyone has told me about this problem before). The problem is that when I send a message to this user, the message bounces with this error: Code: This is the Postfix program at host webserver.detecsa.net. 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 <[email protected][email protected] I'm using ISPConfig 2.1.2 with FC4 (Perfect Setup) I have just one huge / partition with usrquota,grpquota enabled. The mail system is using mbox format. This user has assigned the following: WebQuota: 150 MailQuota: 150 No antivirus-antispam-mailscanner configuration enabled. This is the output of df -h: Code: [[email protected] This is the output of ls -la /var/mail/web3_msalcedo Code: [[email protected] This is the output from repquota -avug | grep web3_msalcedo Code: [[email protected] I hope this information is enough to help me fix this problem. Thanks and best regards.