I have been running a server with a website, say mydomain1.com, for a while now and had no issues sending or receiving email via the default email client in WHM. I just added another domain to my server, mydomain2.com, and I need to send out registration emails from (subdomains of) this website via php. The email sends fine, but looking through the headers of the email I see the following: Received: from 127.0.0.1 (EHLO server.mydomain1.com) (xxx.xxx.xxx.xxx) Message-Id: <1.com> What I would like is for the mydomain1.com in the above to be replaced with mydomain2.com. So I don't know if this is a DNS setup thing or what, I'm not really an expert and haven't run a server with multiple domains before. As the two companies, mydomain1 and mydomain2 are not related, I can't have mydomain1 stuff appearing in emails from mydomain2. Any help would be appreciated, thanks.