Iptables is not blocking an ip?

["chrisl@xxxxxxxxxxxxx" <chrisl@xxxxxxxxxxxxx>]

At one of my customers sites I have iptables configured to drop all ssh packets unless they originate from one of two addresses. However in logwatch, I had login attempts though SSH. 

Illegal users from:
   220.193.2.37: 6 times

Now the address above is not one on the allowed list. Is it possible that they were able to get past iptables to attempt the login?

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