I use a Jekyll and a GitHub Page commenting system known as StaticMan. Each comment requires a comment, a name, and an email. I never see the email nor save it in plaintext. It is hashed and stored using MD5, which allows me to access profile images associated with the email via Gravatar.
There is no requirement that the email or name be real.
If you want a comment removed, contact me with the e-mail address and permalink of the comment you wish to have removed. The permalink can be found by clicking on the date of the comment. For instance, the following is a comment permalink: https://fkarg.github.io/2019-04-19-introduction/#comment1 .
If you want all comments removed with an associated email, contact me with the email and I will remove them.