Mailer Configuration with user name for sender name

Hi, I have recently installed Pydio from the last version of the repository and I was trying to do some configurations on my Pydio Mailer for the “Sender name” field. If I use AJXP_USER variable it works and I receive an email with the username as the name of the sender.

But instead of the username I would like to use there the user display name (user full name) not the username, but I have not been able to find any information or example for this. Is there any variable like AJXP_USER that contains the user display name for use in “Sender name” at the Mailer?