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Excessive DNS lookups from

I noticed on my DNS server that sophos does a lot of lookups to subdomains on
We use OpenDNS for our employees, and we were getting to our limit because of this.  I have since moved the querys to googleDNS, but would like some more info on why sophos does so many lookups to these domains.  Is it a reverse DNS lookup to check websites?

1     *  Actions      293,593
2     *  Actions      196,023
3     *  Actions      195,297
                                                          Total 684,913 in one week


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