Email not saved in database. Gives error "Unable to send e-mail. Please contact the site administrator."

The title says it all. After registration the error "Unable to send e-mail. Please contact the site administrator" pops up. I checked the databases and found out that no email address was saved even though I had not checked the "Don't save email" checkbox.

Fortunately I found the answer myself. I think at least... :P
At lines 48,53,159 there's dummy email address "testing@test.com". then in lines 111 and 117 there is "nobody@nowhere.com" used if there is no email value set in the form. By changing these nobody@nowhere's to testing@test.com it starts to work.

After rethinking this, I presume the problem is that the default value of the email is not setting for some reason. I haven't got the time right now to check why, but this quickfix also works.