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body LOCAL_SHORT_BODY /^.{2,120}$/
describe LOCAL_SHORT_BODY Short body

I included this in my, and gave it a low score as it's not really a great indicator of spam on its own, but in conjunction with other rules I have, it works well.

The problem is, even long emails seem to trigger this rule. Why? I'm pretty sure my regex above is correct (a body of 2-120 chars).

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Aren't you saying match any character (.) two to 120 times? – NickW Apr 15 '13 at 16:29
Yes. I want to match any email that is 2-120 chars in length. Is the above expression considered Perl regex? Do I need the =~ symbol before it? – CaptSaltyJack Apr 15 '13 at 16:36
Though it's not like it's NOT matching text.. it's matching anything/everything. – CaptSaltyJack Apr 15 '13 at 16:40
That's what I'm wondering, it seems at first glance to be correct ^ start . any character {2,120} between 2 and 120 $ end, what I'm wondering is if it could be saying, well, up to 120 characters can be matched in a 2000 character document... – NickW Apr 15 '13 at 16:42
So, if you add =~m/ what happens? – NickW Apr 15 '13 at 16:44

Your rule:

body LOCAL_SHORT_BODY /^.{2,120}$/
describe LOCAL_SHORT_BODY Short body

says that any line in the email has 2-120 characters in it. Almost all mail will match this.

Because whitespace is specially treated, I'd also steer you away from the "right" regex solution of /^.{2,120}$/s but instead I would recommend:

ifplugin Mail::SpamAssassin::Plugin::BodyEval
if can(Mail::SpamAssassin::Plugin::BodyEval::has_check_body_length)
body __LOCAL_BODY_LT_2     eval:check_body_length('2')
body __LOCAL_BODY_LT_120   eval:check_body_length('120')
score LOCAL_SHORT_BODY     0.4
describe LOCAL_SHORT_BODY  Short body

I don't recall when check_body_length() was added, but when it comes to stuff like SpamAssassin, you always want the latest version. The above conditionals ensure that you don't break anything if you're stuck on an older version.

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