Most people want to find a way to get the email they send out of the spam folder but I'm wondering if it's possible to force an email to be marked as spam. I do have a legitimate purpose for this, but I won't be getting into that.
I'm using a PERL script that sets headers then appends a body and sends the message off using sendmail without SMTP.
I did an analysis of several emails marked as spam vs legitimate emails. What I thought would trigger a spam response would be setting various common headers:
X-Spam-Score: 6.5
X-Spam-Level: ******
X-Spam-Flag: YES
X-Spam-Status: Yes
This doesn't cause a message to go into the spam folder.
Since I use outlook, I also tried setting X-MS-Exchange-Organization-SCL: 9 which didn't work.
I tried various other headers as well with no luck. Is there any way to accomplish this?
SpamAssassin publishes a test message for this purpose.
http://spamassassin.apache.org/gtube/