I have installed my Ubuntu 12.04 web server following the guide available on how to forge. Then, I have created one client in ISPConfig. Using this client, I have a domain (example.com) and a mailbox ([email protected]) in the e-mail configuration of ISPConfig. I do not use any DNS system on my server (though Bind has been installed by the procedure) and I have setup my registrar's DNS (OVH) for the domain as follow : Code: .example.com NS Their main server name .example.com NS Their secondary server name .example.com MX 1 example.com .example.com MX 100 example.com .example.com A MY_SERVER_IP www.example.com A MY_SERVER_IP mail.example.com CNAME example.com smtp.example.com CNAME example.com I can see the mailbox using the webmail, but : – I can't use it to send mails (composing a new mail and hitting send doesn't do anything) – When I send mails to [email protected], the webmail doesn't report anything in the inbox. When I try to setup the mailbox (IMAP) using a client (Apple mail) I can go through the IMAP setup (apparently, mail is able to contact the server mail.example.com and log in) but I can't setup the SMTP on smtp.example.com or on mail.example.com or on example.com. The request times out. **What's wrong with my setup ?** Here are the latest mail logs I have replaced my domain by example.com and the IP address from my router at home by MY_HOME_IPV4_ADDRESS. That's probably either attempts from Apple mail to check smtp and imap for the mailbox I tried to configure, or to send an e-mail towards [email protected]. Remark: Of course, my server is configured with the real domain name, not with example.com