Postheadonly, postheadbody Channel Options

Postmaster returned message content
When an MTA channel program or the periodic message     returns messages  to both the postmaster  and the original sender, the postmaster copy can either be the entire message or just the headers. Restricting the postmaster copy to just the headers adds an additional level of privacy to user mail. Note, however, this by itself does not guarantee message security; postmasters and system managers are typically in a position where the contents of messages can be read using system privileges if they so choose.

The channel options  and   are used to control what gets sent to the postmaster. returns both the headers and the contents of the message. It is the default. causes only the headers of the returned message to be sent to the postmaster.

See also:
 * Notification message types
 * Scheduler task options
 * Postmaster addresses
 * Notification messages and postmaster messages channel options
 * Channel options