Validate email formart and domain

email_validator.sh

#!/usr/bin/env bash


function valid_format {
  local email=$1
  local regex="^(([A-Za-z0-9]+((\.|\-|\_|\+)?[A-Za-z0-9]?)*[A-Za-z0-9]+)|[A-Za-z0-9]+)@(([A-Za-z0-9]+)+((\.|\-|\_)?([A-Za-z0-9]+)+)*)+\.([A-Za-z]{2,})+$"

  [[ $email =~ ${regex} ]] || return 1
}

function valid_domain {
  local fqdn=$1

  [[ $fqdn == *"."* ]] || return 1
  host $fqdn >/dev/null 2>&1 || return 1
}


email=$1
valid_format $email

if [[ $? == 0 ]]; then
   domain="${email#*@}"

   valid_domain $domain
   if [[ $? == 0 ]]; then
        echo "LEGIT!"
   fi
fi