The proof is in the pudding. INSKEEP: The proof is in the pudding, he said. Tim Lowe wrote us all the way from Santiago de Cali, Colombia, and he writes the following: Frank, the proof is not in the pudding. It would be a messy, if not completely silly place to keep it.
Every email message consists of two parts, the body and the header. The header can be thought of as the envelope of the message, containing the address of the sender, the recipient, the subject and other information. The body contains the actual text and the attachments.
The envelope will have address information on it, such as the sender, a list of recipients, and who should get errors if something goes wrong (or right, such as your Firebox rejecting an attempt to relay e-mail for a spammer). Headers are inside the envelope, and considered part of the message. Just like the letter in the envelope of postal mail, e-mail messages often have headers with originator (sender) and destination (recipient) information, and a date.