check using mailx

Keeping displaying the presence of exim4, sendmail, postfix, mailutils, and mailx in the right case.

functions/check_deps.sh

@@ -40,6 +40,7 @@ fi
 fn_deps_email(){
 # Adds postfix to required dependencies if email notification is enabled
 if [ "${emailnotification}" == "on" ]; then
+	if [ -f /usr/bin/mailx ]; then
 		if [ -d /etc/exim4 ]; then
 			array_deps_required+=( exim4 )
 		elif [ -d /etc/sendmail ]; then
@@ -49,6 +50,13 @@ if [ "${emailnotification}" == "on" ]; then
 		elif [ -n "$(command -v yum)" ]; then
 			array_deps_required+=( mailx postfix )
 		fi	
+	else 
+		if [ -n "$(command -v dpkg-query)" ]; then
+			array_deps_required+=( mailutils postfix )
+		elif [ -n "$(command -v yum)" ]; then
+			array_deps_required+=( mailx postfix )
+		fi
+	fi
 fi
 }