We have a simple registration form for our website users where we only require an e-mail address and a password (both repeated twice to make sure they are correct). We require that the user confirm their e-mail accounts by clicking a link in an e-mail.
We see that a lot of users don't bother following the link in the e-mail (over 18% never activate their account), and we are wondering how this compares to other websites.
We do not know that our domain is blacklisted anywhere, and it has SPF set up correctly to get through spam filters.
Are there statistics on this that I have missed?