Что означает Group writable directory

Доброго времени суток.
Подскажите,что означают вот такие записи в логах:

May  5 23:09:00 server sendmail[26775]: XAA26773: forward /var/spool/mail/.forward.server: Group writable directory            
May  5 23:09:00 server sendmail[26775]: XAA26773: forward /var/spool/mail/.forward: Group writable directory                  
May  6 02:30:41 server sendmail[27029]: CAA27028: forward /var/spool/mail/.forward.server: Group writable directory            
May  6 02:30:41 server sendmail[27029]: CAA27028: forward /var/spool/mail/.forward: Group writable directory                  
May  6 02:30:54 server sendmail[27033]: CAA27032: forward /var/spool/mail/.forward.server: Group writable directory            
May  6 02:30:54 server sendmail[27033]: CAA27032: forward /var/spool/mail/.forward: Group writable directory                  
May  6 07:03:30 server sendmail[2140]: HAA02134: forward /var/spool/mail/.forward.server: Group writable directory             
May  6 07:03:30 server sendmail[2140]: HAA02134: forward /var/spool/mail/.forward: Group writable directory                   
May  6 07:04:18 server sendmail[2166]: HAA02159: forward /var/spool/mail/.forward.server: Group writable directory             
May  6 07:04:18 server sendmail[2166]: HAA02159: forward /var/spool/mail/.forward: Group writable directory