RO header tag anyone?

[Carl Boberg]

Hi,
Im starting to get an increased amount of mail that ought to be marked as spam but is not.
They seem to have a last header tag of:

Status: RO

Thats after the X-MailScanner tags...

Am I being stupid here or what?

MVH
--------------------------------- 
Carl Boberg 
System & Network Administrator 
Dept. of Information Technology 
Swedish Museum of Natural History
Frescativ. 40 
104 05 Stockholm
carl.boberg at nrm.se 
Phone: 08-519 551 16 
Mobile: 0701-82 40 55 
---------------------------------