Form: option to force it to use setting done in the installtool
It should be possible to force a form to use the mailsettings configured in the installtool to send e-mails (i.e. use smpt instead of php-mail).
Could be usefull in some scenarions to fit the gdpr, i.e. when the webserver and the mailserver are not at the some hosting (the mail is send plain (no https)).