set DBMS to one of "file", "mongodb" or "postgres".

you can change this message to your liking so far as you keep the `##link##` somewhere in your custom message, it will be substituted with the string "link" which will be a live link for users to confirm their emails and complete signup.

if you change this, make sure to use the new value in EmailConfirmationMessage.

while creating a user via the POST /api/users router if RequireEmailVerification is set to true, the registering user will be sent a confirmation link to their email that is valid for 24 hours.

set to one of "file" or "redis".