Hi Shamin,
This shortcode well corresponds to my need, thank you.

However, since my upgrade from FRONTEND PM to PRO version on 31/08, a problem was appeared (which apparently also interferes with the operation of the shortcode in the filling of the recipient (the recipient implemented is systematically the ADMINISTRATOR)).
The problem: To send a new message, I enter the user name of the recipient (ARALprem in the example), the tool searches for the account but never finds it. However this account is in the directory and worked very well (like all the features) before the upgrade of the PRO version.
It is therefore impossible to send a new message!

Can you help me solve this problem.

Thank you