A new format of spam

[Peter Tomlinson]

This may be off topic, or it may not...

Recently the pattern of spam received here has changed. A significant 
proportion of the messages now have a header in the form of a message 
from sysadmin to users on their own organisation's network - doesn't 
work here because I'm a one man band who looks at the sender's ID before 
opening mail (and use Kaspersky which usefully gives me the headers of 
most messages in a preview window), but I can see that in a large 
organisation a significant proportion of these would be opened.. Often 
therefore the forged source is obvious to me, because the purported 
sender is postmaster@<the same domain as the recipient's mailbox>. 
Sometimes the message is formatted as a message to oneself, i.e. source 
and destination mailbox and domain the same. The titles are sometimes 
official, at other times personal:

"Catch up file"
"Are you at work?"
"Release date"

"How's your family?"
"Hollywoods hottest secret , Acai Berry Diet"

I have never opened any of these, but have looked at the source of a few 
of them and the headers of rather more, and cannot see what the scam is. 
Anybody know?

Peter