I don't have any from my Inbox, but here are a few from my Junk email folder for the Hotmail account in Windows Live Mail...
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
-- Jim
That would be V=1.1;us=0;l=0;a=0;D=2;GD=2;SCL=6. This is consistent with the assumption, too.
Personally I have some legitimate (zero-SCL) messages here that have l=0. There are even messages from the same sender which have X-Message-Delivery values that differ only at l (one has V=1.1;us=0;l=1;a=1;D=1;GD=1;SCL=0 (images displayed), the other V=1.1;us=0;l=0;a=1;D=1;GD=1;SCL=0 (images blocked)).
Maybe Microsoft could explain what other parameters mean.