You can select both "forward mail" and "normal mail" type in add_mail_acc.tpl. You must select one of them. When you select both, mail type status shows unknown. It must be radio button or you can add js code to act like radio buttons.
This simple javascript code that checkboxes acting like radio buttons.
// js function start
function switchCheckbox( objChecked, objUnchecked )
{
objChecked.checked = true;
objUnchecked.checked = false;
if ( objChecked.checked = true )
{
objUnchecked.checked = false;
} else if ( objChecked.checked = false )
{
objUnchecked.checked = true;
}
}
// end
in add_mail_acc.tpl change modified lines.
<input type="checkbox" name="mail_type_forward" value="1" {FORWARD_MAIL_CHECKED}
onClick="switchCheckbox(this.form.mail_type_forward,this.form.mail_type_normal); changeType();">
<input type="checkbox" name="mail_type_normal" value="1"
onClick="switchCheckbox(this.form.mail_type_normal,this.form.mail_type_forward); changeType();" {NORMAL_MAIL_CHECKED}>