Hi, I am able to receive emails in outlook express using either www.mydomain.com or server1.mydomain.com but pop3.mydomain.com doesn't work so is smtp.mydomain.com for sending mails. DNS records in ISPconfig Box A Record Hostname www IP 192.168.1.254 Hostname server1 IP 192.168.1.254 CName Hostname pop3 Target www Hostname smtp Target www MX record www.mydomain.com Configuration at my domain registrar's Cpanel A Record www.mydomain.com 18.104.22.168 (my static IP assigned in router) server1.mydomain.com 22.214.171.124 CName pop3.mydomain.com www.mydomain.com smtp.mydomain.com www.mydomain.com MX record server1.mydomain.com if i use pop.mydomain.com in outlook express for receiving mails it returns this error The host 'pop3.mydomain.com.com' could not be found. Please verify that you have entered the server name correctly. Account: 'Work', Server: 'pop3.mydomain.com', Protocol: POP3, Port: 995, Secure(SSL): Yes, Socket Error: 11004, Error Number: 0x800CCC0D www.mydomain or server1.mydomain.com works fine. I am able to ping both pop3.mydomain and smtp.mydomain.com from another machine(win) in my LAN if it's DNS server is set to my ISP DNS servers but it fails if the DNS server is set to ISPconfig Box. port forwarding is also done for ports 25,110,995. How can i fix this?