Add clamav virus scan to mails

etc/clamav/clamav-milter.conf

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+#Automatically Generated by clamav-milter postinst
+#To reconfigure clamav-milter run #dpkg-reconfigure clamav-milter
+#Please read /usr/share/doc/clamav-base/README.Debian.gz for details
+MilterSocket /var/spool/postfix/clamav/clamav-milter.ctl
+FixStaleSocket true
+User clamav
+ReadTimeout 120
+Foreground false
+PidFile /var/run/clamav/clamav-milter.pid
+ClamdSocket unix:/var/run/clamav/clamd.ctl
+OnClean Accept
+OnInfected Reject
+OnFail Defer
+AddHeader Replace
+LogSyslog true
+LogFacility LOG_LOCAL6
+LogVerbose false
+LogInfected Full
+LogClean Off
+LogRotate true
+MaxFileSize 25M
+SupportMultipleRecipients true
+RejectMsg Blocked by ClamAV %v
+TemporaryDirectory /tmp
+LogFile /var/log/clamav/clamav-milter.log
+LogTime true
+LogFileUnlock false
+LogFileMaxSize 1M
+MilterSocketGroup clamav
+MilterSocketMode 666