UNCHECKED contents in mail FROM [65.55.34.204]:53396

hello.
i install a new cwp server.
everytings fine but i got this message incoming mail.

UNCHECKED contents in mail FROM [65.55.34.204]:53396

No viruses were found.

Content type: Unchecked
Internal reference code for the message is 02228-01/MoYXbCkmgvYB

First upstream SMTP client IP address: [65.55.34.204]
  col004-omc4s2.hotmail.com
According to a 'Received:' trace, the message apparently originated at:
  [65.55.34.199], COL004-OMC4S2.hotmail.com col004-omc4s2.hotmail.com
  [65.55.34.204] using TLSv1.2 with cipher AES256-SHA256 (256/256 bits) No
  client certificate requested

how can i fix this.

thank you

That because your server recieve email contain rar attachment, may be other archive file too (ace, lha) where amavis cant extract it.