A small company have asked me to fix up their Exchange server since it went down some time ago.
Since this happened, they decided to start using the webmail hosting service provided by 123-Reg, who also provided them with their domain name.
They're going to want their email directed back to their static IP, of course.
In the 123-Reg control panel for that domain, their are 4 A records: @, *, mail, and www. All these point to 123-Reg's servers, with the same IP.
There is also an MX record, pointing to mail.theirdomainname.co.uk.
Is it really as simple as changing the A record for mail from the 123-Reg server address to their static IP, and that's it, or have I missed something?