How to send emails from Virtualbox guest with VM hostname instead of VM IP in header

Hi all,

I tried to send emails from an Ubuntu Virtualbox guest with an email client (not a server).

The header of messages sent does not contain the VM hostname but the VM IP address :

Received from [10.0.2.15] ([my IP address]) [...]
X-ME-Helo [10.0.2.15]

I first tried NAT mode and then Bridged networking mode, but same result...

Is there a solution to display the VM hostname instead of the VM IP address ?

Thank you.