--- a/thesis/img/Makefile	Tue Jan 06 19:00:31 2009 +0100
+++ b/thesis/img/Makefile	Fri Jan 09 14:21:45 2009 +0100
@@ -3,7 +3,7 @@
 # requires: pic, troff (with font Palatino), grops, ps2eps
 
 #IMG=`ls *.pic | sed 's/\.pic$$/.eps/'`
-IMG=comm-classification.eps masqmail-arch-new.eps comm-lifecycle.eps email-swot.eps
+IMG=comm-classification.eps masqmail-arch-new.eps comm-lifecycle.eps email-swot.eps mta-channels.eps
 
 
 .PHONY: all

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/thesis/img/mta-channels.pic	Fri Jan 09 14:21:45 2009 +0100
@@ -0,0 +1,24 @@
+.PS
+# in and out channels of an mta
+
+linewid = 1.5
+
+
+A: box "MTA" wid 1.5*boxwid ht 1.5*boxht
+
+line <- left from 0.3<A.w,A.nw> "remote (SMTP)" above
+line <- left from 0.3<A.w,A.sw> "local (stdin)" below
+
+line -> right from 0.3<A.e,A.ne> "remote (SMTP)" above
+line  right linewid*2/3 from 0.3<A.e,A.se> "local (pipe)" below
+line -> down 1/6*linewid
+B: box "MDA" wid 0.75*boxwid ht 0.75*boxht
+
+move 0.5*moveht
+
+C: box invis "mailboxes" ht 0.3
+
+arrow from 0.35<B.sw,B.se> to 0.2<C.nw,C.ne>
+arrow from 0.45<B.sw,B.se> to 0.4<C.nw,C.ne>
+arrow from 0.55<B.sw,B.se> to 0.6<C.nw,C.ne>
+arrow from 0.65<B.sw,B.se> to 0.8<C.nw,C.ne>