[Change] set email alerts to disabled when -z $mail / issue verbose w…

…arning on CLI; issue #220

files/internals/functions

@@ -105,7 +105,7 @@ prerun() {
 		exit 1
 	fi
 
-	if [ ! -f "$mail" ]; then
+	if [ ! -f "$mail" ] || [ -z "$mail" ]; then
 		email_alert=0
 	fi
 
@@ -1073,6 +1073,9 @@ scan() {
 		eout "{scan.hook} scan of $spath in progress (id: $datestamp.$$)"
 	fi
 	cnt=0
+	if [ -z "$mail" ]; then
+		eout "{scan} no \$mail binary found, e-mail alerts disabled."
+	fi
 	if [ -f "$clamscan" ] && [ "$scan_clamscan" == "1" ]; then
 		if [ -z "$hscan" ]; then
 			eout "{scan} found clamav binary at $clamscan, using clamav scanner engine..." 1