Some recommend way to prove the authenticity of an email:
- The coworker as truthful to the company or organization he or she has to check where the same mail is sent long back to the same sender.
- If search on emails sent item if he sends it will be well and good. Some time backup the mail will be help to proven authenticity of an email.
- Sometimes once mail is downloaded into ms-outlook or lotus domino some time mail persists in the mail server.
- He or she can coordinate with the mail server administrator to possible get a log file of sending mail and he can proceed as a record to management.