[Mailman-Users] duplicates

[Marco Stoecker]

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Hi,

I have Mailman up and running. I just sent an e-mail to 5 lists and
the e-mail came duplicated to the recipients. I checked the header and
the only difference is the following:

1. Header:
X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00
autolearn=unavailable version=3.3.1

2. Header:
X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00
autolearn=ham version=3.3.1

How can a avoid duplicates in future? What is the reason?

BR
Marco
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