Where has the 'emailstop' user profile field gone?

In Moodle 1.9 there was the possibility to add fake emails to users profiles and set the 'emailstop' . We work with primary school children and in the beginning they do not have an own email, so it's important for us that we can stop the sending of mails. I saw that there is the field 'emailstop' in the database but it is not used in the profiles. Please add this again to Moodle 2.0