1. A method for identifying any discrepancies in an email distribution list, the method comprising: receiving, from an originating client an email addressed to a list of recipients, in an email server; and comparing in the email server the list of recipients against a trusted distribution list; and identifying one or more possible amendments to the list of recipients if the list of recipients differs from the first trusted distribution list by more than a predetermined amount; and informing the originating client of any identified amendments; and determining in the email server whether the list of recipients should be promoted to the trusted distribution list.