Send email with cron job

Hello i have a script in sheel for sending email when my disk is full %. But i not received email.

How i verif if the service of email work fine?

My code:

#!/bin/bash

script that will send an email to EMAIL when disk use in partition PART is bigger than %MAX

adapt these 3 parameters to your case

MAX=70
EMAIL=yurickbr@gmail.com
PART=/dev/vda1

USE=df -h |grep $PART | awk '{ print $5 }' | cut -d'%' -f1
if [ $USE -gt $MAX ]; then
echo “Percent used: $USE” | mail -s “Running out of disk space” $EMAIL
fi

Thx!