Our content checker found
virus: Eicar_test_file

in an email to you from unknown sender:
claiming to be: <>

Our internal reference code for your message is 09107-01/yCsDAaKpFnpZ

First upstream SMTP client IP address: []
According to a 'Received:' trace, the message originated at: [], (unknown [])

Return-Path: <>
Message-ID: <27967613.01164084743785.JavaMail.root@xxxx.vicp.n et>
Subject: =?utf-8?B?5Y+I5p2l5LiA5Liq5q+S?=

Subject can not show utf-8 character!

any idea?