Disable function mail php

How can I disable the php mail function?
I have a user sent spam.

mail('user@example.com', 'My Subject', Hello);

Is a suggestion to have this option in the settings of i-MSCP.

yes, put the i-MSCP uses several "php.ini"
ever did change, however this change will not stand, for it just to make any changes on the client it back to default setting.
would be very interesting to have the option of disabling direct mail function in the configuration panel.

I-MSCP v1.1.11

fcgi directory does not exist

but in
/etc/php5/fpm/pool.d/domain.tld.conf
add in
php_admin_value[disable_functions] = show_source,system,shell_exec,passthru,exec,phpinfo,shell,symlink,proc_open,popen,mail
Resolved.

Nuxwin plans to deploy the "mail" at:
Value for the disable_functions directive ?

I think very valid!

@Nuxwin I'll wait for her in the next version! Thank you!