How can I ensure that an email is actually being sent by the person in the FROM: line of the message?
In general, without specific add on security, the authenticity of an e-mail message cannot be assured. This means that the authorship or source of an e-mail message may not be as indicated in the message. Internet Mail Extensions (S/MIME), digital signatures, and certification authorities can help to confirm sender authenticity however the use of these methods is not included as part of a basic email package and must be purchased separately.
