My email server IP blocked by gmail

I got an error while sending emails to gmail "Our system has detected an unusual rate of 550-5.7.1 unsolicited mail originating from your IP address. To protect our 550-5.7.1 users from spam, mail sent from your IP address has been blocked. 550-5.7.1" How can i know that who is sending more emails in virtualmin and how to get rid of this error.

Status: 
Closed (fixed)

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