Internet must be used for communication with family and friends. We should not use the internet chatting for communicating with strangers and should not forward the emails from strangers. And we must teach children about the risks involved by chatting or forwarding emails to strangers. 

Generally children should be advised to use email and chat for communicating only if necessary or otherwise it is better to avoid using since the children are susceptible and may share some sensitive information about the family which may invite unnecessary issues.

Security tip: Children should be allowed to use  the internet under the supervision of parents only