............ 
                                ------------ : amavis-ng : 10024 <------+
			        v            : clamscan  :              |
                              10025           ............              |
                  ..................................                    |
                  :             |                  :                    |
Unfiltered mail----->smtpd \    v           /smtp----->  Spam filtered -+
                  :         -cleanup->queue-       :
               ---->pickup /                \local----->Spam/Virus filtered
               ^  :           Postfix      |       :
               |  :                         \pipe-----+
               |  ..................................  |
               |                                      |
               |                                      |
               +-Postfix sendmail<---- spamc filter <-+