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%FW-5-POP3_INVALID_COMMAND: Invalid POP3 command from initiator

Last Modified: 2012-09-06

I am getting this log frequently on my router and I don't know what is the cause.
%FW-5-POP3_INVALID_COMMAND: Invalid POP3 command from initiator ( Invalid verb

the IP is the IP range of internal clients and I have this message from many different clients. I was wondering if the thunderbird is the cause but it is not.

anybody knows what is the cause of this request and log.
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