My question to all linux wizards. I am though very new to linux, I was able to setup ISPCONFIG 3 on my ubuntu 10.04 64bit desktop. Every thing in the server is running fine. All services are running fine as well. The problem I am facing is I am able to send mails from outside to my mail addresses configured in ISPCONFIG, but I am not able to send the mails to outside users. I am getting the error like Code: From: Mail Delivery System <[email protected][email protected][email protected] I did check the link given http://mail.google.com/support/bin/answer.py?answer=10336 In this URL link it mentions that sending IP address does not match the sending domain. I couldn't locate the problem except that the sender host is mentioned as server1.mywebhostings.biz and not orissaitbazar.com. could this be the problem. Both the domains that host server1.mywebhsotings.biz and orissaitbazar are on same ip address. Please note that I am using static ip and not dynamic ip. I have looked everywhere to find the solution, but I couldnot find a solution.