Email

How can I make it safer?

Consider adding a program like Spam Arrest or TMDA to children's email. These programs only allow people on the "allow list" to send an email to the child and force unknown email addresses to confirm themselves before sending email to the child’s Inbox.
Know children's login information and email addresses. What name did the child use for their email address? Does it provide identifying characteristics about her/him or her/his hobbies (e.g. shygirl, bookworm, etc.)?
Monitor any exchanging of pictures via email.

Discuss with children how the Internet is a public place.
Explain to children that pictures should not be sent or posted online without parental permission. Once sent, control over what happens to the pictures is lost.