Little off topic, but check your domain settings at http://www.dnsreport.com/ It gives out comprehensive report, it may help you.
-Nitin
Nipun Jain wrote:
My default_host is set to local host and only registered users can login to the webmail. Although auto create user is set to true, as new accounts are being created everyday (through on a gmail like invitation basis). I know that the reply to address can be configured through email clients also but if I am able to disable it throgh roundcube, thats one less way to spoof for the users. If its possible, please reply. Also, does anyone else able to spoof emails using the reply to address in roundcube? I can test as my hosting is supended.