> > I have been trying to track down research discussing the use of two vs one > field for entering an email address on an online form. >
I could be wrong about this, but I think the duplicate email field method is
something developers started using to cut down on invalid registrations as a
result of typos. It seems the theory is that by using two fields, the user
has to enter it twice and validation code can be used to make sure they
match, thereby decreasing the chances the entered address is incorrect. I'm
not sure this would stop spam-bots, so I'm not sure that's a reason behind
it, but again, I could be wrong.
An alternate solution is to send the new user a confirmation email and have
him/her click the link in the email to confirm it was received and the
address is valid. But this is far from perfect.
You'd probably have just as much success by asking new registrants to
confirm the sign up information while offering the ability to edit it before
saving it to the database. I've never tried this personally, but it's an