You can still automate Let's Encrypt even if your system requires a DNS challenge. Using these PowerShell scripts and Amazon Web Services' DNS service Route 53 will do the trick.

The Internet Security Research Group and its Let's Encrypt project -- a free, automated and open security certificate authority -- wants to make the Internet securer than it is today.

Let's Encrypt, the Internet Security Research Group 's free certificate signing authority, issued its first certificate a little over four years ago. Today, it issued its billionth.

Let’s Encrypt is ending expiration notice emails—for some very good reasons To save money and protect privacy, the successful service won't bug you.

Let's Encrypt engineers said that of the 116 million TLS certificates that are currently active, only 2.6% are impacted by this issue, representing 3,048,289 certs.