Linux command line based spam checker

Does a command line based spam checker exist?

We have created a mailbox at a 3rd party, and unfortunately decided on spam checking 'disabled' in the initial setup.

There is no way to re-enable spam checking, the mailbox must be delete (and thus all contents lost) and re-created.

Does anything exist where we can pump in either:

A) Subject + from + to + body + all other fields.

OR

B) Raw message dump (headers + body).

And the command line will let us know weather the email is possibly spam?

Thanks.