I have seen some mail coming in as replies to messages sent by my users that got tagged as spam ('[SPAM]' added to the subject line) by the recipient but they left the spam tag in the subject line. My mail host uses spamassassin to do the same thing which I filter on using a header filter that looks for [SPAM] in the subject header. Obviously these replies are getting filtered so I attempted a workaround that failed and I need help figuring out why. I replaced the header filter with an expression filter that detected: Subject: [SPAM]*. It failed to detect any [SPAM] tagged messages. I double checked for typos and spacing but no joy. A look at the manual shows the bracket symbols as defining a set of characters so before I load the users mailboxes with spam again I thought I would ask for some help. I am thinking this should work: Subject: [[]SPAM[]]*. Thoughts please.
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