Ddclient is a Perl client used to update dynamic DNS entries for accounts on 'Dynamic DNS Network Services' free DNS service. It currently supports a lot of different routers and a few different services..

This version also had built in support for sending updates with a gmail account as relay.

Configuration
Click "Advanced View" in the upper right corner.
Change the mail paramter to yes or no.
For email notofications scroll down to Extra Parameters and add a fqdn some thing like "-h ddclient.local" or "-h ddclient.mydomain.com" this can be anything you like.
After the first run turn off the docker and modify your client config and mail.txt(for mail support) in your config directory.