Header option file location

For destination channel based header trimming to be applied upon message enqueue after normal header processing, the MTA looks in the  table directory, , for header options files  with names of the form  , where    is the name of the channel with which the  header option file is associated. (In Unified Configuration, such header options files continue to be used.) The   channel option and/or the    channel option  must be specified on the  channel to enable the use of such a header option file.

For source channel based header trimming to be applied upon message enqueue before normal header processing, the MTA looks in the table  directory, , for header options files with  names of the form  , where    is the name of the channel with which the  header option file is associated. (In Unified Configuration, such header options files continue to be used.) The   channel option must be specified on the channel to enable the use of such a header  option file.

Header option files should be world readable.

See also:
 * Header option file format
 * Header option files