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Expression filter blocks (almost) everything

I'm using the expression v|agra that is apparently causing most of our mail to get blocked (some get through).
Any idea why? Isn't the | sign allowed in the expression filter?
I sent an empty mail to test things out:

   ----- The following addresses had permanent fatal errors -----

    (reason: 550 X-Regex-Match: v|agra (blacklisted))

    (reason: 550 X-Regex-Match: v|agra (blacklisted))

   ----- Transcript of session follows -----
... while talking to mail.xxxx.be.:
>>> DATA


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  • nope, doesn't work.  Sending a test mail results in:

    Content Scanner: X-Regex-Match: v|agra (blacklisted)


    I found that the | character is the same as \x7c
    So I used v\x7cagra in the expression, but (although it results in looking for v|agra), it doesn't work either.  My test mail still gets blocked with:

    Content Scanner: X-Regex-Match: v|agra (blacklisted)


    anyone have a solution for me?
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