Think about it this way: I register for your website under the email address . That’s probably going to bounce off of the illustrious mail daemon, but the formatting is fine; it’s a valid email address.
To fix this problem, you implement an activation system where, after registering, I am sent an email with a link I must click.
An is a digital signature with several key properties.
It defines a process and a format for generating digital signatures in the XML format, and it has many additional features.
Generally great plugin, but this one is a deal breaker - I would prefer to validate only when triggered manually, i.e.