How do I change the hostname used when Mac Mail sends EHLO

Hi All,
I work for a tech support group and one of our clients is experiencing some trouble sending emails. When they connect to their outbound mail server Mac Mail sends the EHLO command with a hostname like 01:23:45:67:89:ab.home
Another Mac on the network sends a hostname like 00:A0:C9:14:C8:29.home2
So they appear to be the a Mac address for the computers NIC followed by a generic location in this case .home, not sure if thats a generic Mac thing or something they chose to configure but because the hostname is not an ip address and contains ".(dot)home" the outbound mail server our client uses believes it to be a domain so then rejects it as an invalid domain when a lookup on it fails.
I've changed the hostname of one of the Macs using the command "cutil –-set HostName new_hostname"
This has changed the hostname when checking it by the hostname command in a Terminal but Mac Mail still persists in using the old hostname. We've tried rebooting the machine and rebooting the machine with the left shift key held down as I believe this does some kind of rebuild of configuration files, but still the old hostname is send when Mac Mail sends EHLO.
How can I force Mac Mail to pick up the new hostname or is there something else I need to do to change it?
thanks for any assistance you can provide,
Martin

Replying to myself:
You can sign out from the account in iBooks and then sign in to another one.
From the menu bar, choose:  Store->Sign Out
Then sign in again with the desired ID: Store->Sign In

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