what does this mean?

[Man-wai Chang]

> Perhaps you are the exception to this rule, but it would be useful to check 
> anyway. Are you running (and logging) a firewall? Are you running Tripwire - 
> what does it say?

After thorough checking, it seems that it's just a message that blocked 
one of the remote pop3 servers from which I run fetchmail to fetch my 
messages. I don't know why it blocked fetchmail.

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