Attention important notice:
Please do not use email addresses with the domain part "gmail.com". These cannot be delivered by our email server and end up in nirvana!
Please use a completely different email address instead or simply change the domain part "gmail.com" to "googlemail.com" (i.e. instead of email@example.com - firstname.lastname@example.org) - then everything will work fine and you will receive an email immediately after registration to activate your account.