Thanks, Joe Wolf. I'm not familiar with the "no subject, no body" problem. You can see the inbox view from here and the message details screen grab is here. There is a subject and there is a body. It looks to me that the email can't possibly be 0bytes and the spammer is somehow spoofing the size? A mystery to me but this has spiked in the last two weeks.

Please use Bruce Barnes anti spam document to ensure your server is setup well:

 

Sounds like IS addresses, e-mail addresses or domains are whitelisted or the users or domains can override and set their own spam settings (we never allow that) or there are other issues.

 

With the latest version of SmarterMail 12.4, the internal spam checking is better than ever.

 

We use no external tests, allow no whitelisting, enforce greylisting (for 1 minute now) and take total control of the MX server - almost completely eliminating spam.

 

I'm in the process of updating now - using the tighter settings we've tested on both my SmarterMail server, a SmarterMail server in Pennsylvania - that services several hundred accounts, and on an ISP in New Orleans, with close to 3,000 accounts, and have no spam problems whatsoever.

I should have the latest version online by tonight.  Here's the link to what will always contain the most recent version: https://portal.chicagonettech.com/kb/a171/smartermail-antispam-settings-document.aspx

 

Been investigating these guys for a while and just added them based on the e-mail address of "Genie Bra" being blocked - along with some other reputation information about them.  Here's a link to their website: http://www.gbudb.com/index.jsp

 

It's added as an RBL, and both the ENABLE FOR FILTERING and ENABLE FOR SMTP BLOCKING columns should be checked.

 

Don't forget to SAVE it all when you get done:

 

 

UPDATED: Antispam document updated with this and two other new RBLs and the background information.