Why do you ask users to confirm their subscription with the word ‘agree’?
WordPress has been known now and again to be a target for spammers. Most of it is in the form of comment spam.
This is why we make subscribing to your site just a little bit harder than it needs to be.
When someone subscribes to your site or comments on a post they have to opt-in. We send them an email with an overview of how it all works and prompt them to confirm their subscription by replying with the word agree. We don’t give them a convenient link because bots know how to click links. They’ve been doing it for years.
This method keeps the bots out and by training users to the behavior at present we can do something even cooler (and absolutely bulletproof) in the future: let the site admin define a question which the subscriber has to supply the correct answer to.
For example the subscription confirmation email on a Vermont-based blog might say in order to confirm your subscription please answer the following question: what is Vermont’s sweetest export? The answer, of course, would be maple or maple syrup.
These options put us in a good place to keep bots from ever becoming email-based subscribers to our customers’ sites.