Brand new single server Centos 6 ISPConfig 3 /last version/ Postfix works - sending and receiving email for root without problem. In ISPConfig I have added: Email -> Email accounts -> Domain added new domain example.com after that in Email -> Email accounts -> Email Mailbox added new mailbox firstname.lastname@example.org Now I login thru Webmail (squirrelmail) to this virtual account. Sending emails without problem. Rceiving emails from myself (from email@example.com to firstname.lastname@example.org). The problem is that I can not receive email to this box from outside. Always receive SMTP 5.1.1 Recipient address rejected. User unknown in local recipient table. I'm fighting with this second day without any success ... Please help. Nothing in mail error log. Most probably postfix does not loading properly virtual mailboxes from mysql table. How to fix this?