[SA-exim] Documentation tip

[Ross Boylan]

FYI SA 2.60 deprecates an option mentioned in INSTALL for sa-exim, and
suggests an alternative:

always_add_report { 0 | 1 }   (default: 0)
 When the report_safe option is turned off, mail tagged as spam will
 include a report in a header named X-Spam-Report.  If you set
 always_add_report to 1, the report will also be included in the
 X-Spam-Report header for non-spam mail.

 This option is deprecated in version 2.60 and later.  It will be
 removed in a future version.  Please use the flexible add_header
 option instead:

 add_header all Report _REPORT_
-- 
Ross Boylan                                      wk:  (415) 502-4031
530 Parnassus Avenue (Library) rm 115-4          ross at biostat.ucsf.edu
Dept of Epidemiology and Biostatistics           fax: (415) 476-9856
University of California, San Francisco
San Francisco, CA 94143-0840                     hm:  (415) 550-1062