Hosts are blocked to prevent our system from being flooded with unnecessary updates from broken or misconfigured update clients.You likely had no way of knowing there would be a problem until you received the notice in your Email.You will also be prompted for the username/password your registered with your Dynamic DNS service.Lastly, you will be asked which ethernet port you primarily use to connect to the Internet (eth0 for wired or wlan0 for wireless, usually).WARNING: Wait at least 5 minutes between update attempts.Can't exec "sendmail": No such file or directory at /usr/sbin/ddclient line 1465.The update client periodically checks your network’s IP address; if it sees that your IP address has changed, it sends (updates) the new IP address to your hostname in your Dyn account.If you’re like many Dyn DNS customers, you have a dynamic IP address which changes periodically (monthly, weekly or even daily).
We recommend you use one of the official Dyn Updater Clients.
"I want to send updates myself via TSIG rather than install software." Many hardware devices, such as DVRs, webcams, routers, etc, have built in update clients.
Unfortunately, as they are all third-party products, you’ll need to contact the manufacturer for support with the device. If your host was blocked for abuse, it probably wasn’t something that you did intentionally.
(You may need to add the Ubuntu Universe to your set of software repositories to install some of these utilities.
See Installing Software.) ddclient is the original Linux utility for dynamic DNS updates.