#!/bin/sh
case "$reason" in (BOUND|RENEW|REBIND|REBOOT)
(
   echo To: me@my.email
   echo From: me@my.email
   echo "Content-Type: text/html; "
   echo Subject: DHCP reason: $reason
   echo
   echo Your IP address is: `curl -s https://api.ipify.org`
) | sendmail -t
;;
esac

#!/bin/sh
(
   echo To: me@my.email
   echo From: me@my.email
   echo "Content-Type: text/html; "
   echo Subject: IP address change
   echo
   echo Your IP address is: `curl -s https://api.ipify.org`
) | sendmail -t