When the error was discovered, college staff sent a second e-mail asking students, optimistically, if they would 'please delete the e-mail previously sent out as it contained inaccuracies'.

Only the most unusual person, with almost no computer training, would require even five seconds to delete an e-mail.

Even better-you won't 'lose' comments by accidentally deleting your e-mail.

This bought him just enough time to go round deleting the e-mail from each of his colleagues' inboxes.

Delete all e-mails from senders not known to me.