Presently, when users create their account there isn't a notice telling them to expect a verification email. We think that more users will confirm their email if they are told to go to their inboxes and click on that verification email. Therefore, when a user creates their account they should see text on Special:CreateAccount that explains a verification email is coming to their inbox.
Add an additional line of text below the user benefit assistive text (proposed on T215656) letting the user know that a verification email will be sent to the supplied email address.
Please look out for an email from us to confirm that the address supplied is correct.