I added some special help pages - one after pressing the instant payment button and one after sending the confirmation e-mail, both answering 99% of common questions.
But looks like people never read them :(
If you are using hotmail.com with high anti-spam filter settings, you'll need to add "
no-reply@deepbit.net" to your contacts.
If you are using yahoo.com and can't receive the confirmation message, PM me your login name.