Conversion script exit statuses

The exit status returned by a conversion script (returned via the    option in the   file on UNIX) can be used to  tell the conversion channel to take one of a variety of actions. The conversion status values are defined in the file  SERVERROOT ; see that file for the  definitive numeric values of the status codes. Available status names, numeric values (as of this writing---but see the    file for definitive values), and their meaning,  are shown in  Conversion exit status.

See also:
 * Notification message types
 * lines_to_return MTA Option
 * Postmaster addresses
 * Diagnosing .HELD files
 * Sieve discard and jettison actions
 * Conversion control