If your sister is being bullied by e-mail from this site then this is what she needs to do:
1. Block the person from e-mailing her by clicking on the "Ignore" button under the last message she received.
2. Save the message in her default mail folder
3. Send a message to Petrarca, the Site Administrator and report this person. He can then look at the e-mail and determine what needs to be done about the person bothering her.
Finally, this sort of bullying happens from time to time accompanied by threats. But the people doing it truly have no way of following through on their threats, so there is no reason to be scared.