mass bounced emails

[Obantec Support]

Hi

Running SA3.2.3 but seeing a lot of bounced emails being sent to my 
customers. (not emails they are sending out but faked returns)

various subjects

From: [EMAIL PROTECTED] (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender

From: [EMAIL PROTECTED]
Subject: Delivery Status Notification (Failure)

but always to a valid users mbox

should loadplugin Mail::SpamAssassin::Plugin::VBounce in v320.pre not catch 
these?

Mark