Content return block limit MTA option

Notification message MTA options:  (non-negative integer)
The  MTA option may be used to force on the NOTARY (RFC 1891) non-return of content flag for messages over the specified size (in units of MTA blocks); if such a message is  subsequently bounced by a system that supports NOTARY, then the original message contents will not be included in the bounce message. By default, this option is not set and hence entire original messages of arbitrary size potentially may be included in bounce messages; however, even when this option is not set, the MTA will automatically truncate original message content when generating a notification  message  if a message size limit (e.g., the   channel option) has been imposed  on the relevant destination channel.

This option only applies to messages that do not have their own explicit NOTARY (RFC 1891) setting controlling return of content; when NOTARY has been used, it takes precedence over this option.

See also:
 * Notification message generation timing
 * Notification message MTA options
 * Message size MTA options
 * block_size MTA Option
 * blocklimit Option