Someone else here points out that a MITM to Let&#x27;s Encrypt could cause you to host someone else&#x27;s ownership challenge for the domain, thus the attacker could use you to prove the attacker controls your domain name.<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10678557" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10678557</a>