version supplied with Exim always accepts, but this is a hook for sysadmins to
supply their own checking code. The local_scan() function is run even when all
the recipients have been discarded. */
+/*XXS could we avoid this for the standard case, given that few people will use it? */
lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);