List and send, one by one, by email pdf and png files matched within directory where the script is located

send_attachements_one_by_one.command

#!/bin/bash

DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
cd "${DIR}"

MAILTO="abcd-1234@xyz.go"

find . -type f -depth 1 -iname "*pdf" -o -iname "*png" | while read f
do
  ATTACH=$f
  BASENAME=$(basename "$ATTACH")
  SUBJECT="Send $BASENAME"
  BODY="Auto sent message with attachement $BASENAME"

  echo "encode $ATTACH to $BASENAME and send to $MAILTO"
  (
   echo "To: $MAILTO"
   echo "Subject: $SUBJECT"
   echo "MIME-Version: 1.0"
   echo 'Content-Type: multipart/mixed; boundary="-q1w2e3r4t5"'
   echo
   echo '---q1w2e3r4t5'
   echo "Content-Type: text/html"
   echo "Content-Disposition: inline"
   echo $BODY
   echo '---q1w2e3r4t5'
   echo 'Content-Type: application; name="'$(basename $ATTACH)'"'
   echo "Content-Transfer-Encoding: base64"
   echo 'Content-Disposition: attachment; filename="'$(basename $ATTACH)'"'
   uuencode -m "$ATTACH" "$BASENAME"
   echo '---q1w2e3r4t5--'
  ) | /usr/sbin/sendmail $MAILTO
done