It would bar the hacker from sending more emails and anyone else from disseminating the contents of them, according to chairman of governors Joshua Rowe.

He told the Jewish Telegraph: "We want to stop this malicious dissemination of emails.

"It's pure malice and the police are treating this as a serious criminal offence

"When they complete their investigation, hopefully this person will end up with a long prison sentence."

The hacker has sent more than 15 emails in the last fortnight to a mailing list that includes parents, school staff and members of the Jewish community. They were hacked from the Google Mail account of the school bursar.

Since last week's Jewish Telegraph Page One article covering the initial emails, further messages have been leaked.

The emails included details of paying for a teacher's hip replacement and a confidential document containing the names, addresses and financial commitment of a number of nursery donors. The school is now certain it has tracked the hacker to Israel and acknowledges that the incident is being treated as a "serious crime".

A police investigation is currently underway in Britain and Mr Rowe said there is one set to commence in Israel.

He added: "It is hugely embarrassing for people to have their name and confidential information distributed all over the Internet. They are distraught.

"We've had lots of contact from parents who are livid about the perpetrator.

"We know exactly who it is. We have the evidence and have a full tracking of everything they have done.

"When the police finish the investigation and when they prosecute, it won't be pleasant for the perpetrator."

During the investigations, King David has been ensuring that its current email system is impenetrable to future attacks.

Mr Rowe continued: "We have got a security company in and they have been firewalling, securing the system and making sure there are no bugs or entry points in the system.

"I think this is straightforward criminality."