[exim] Amavis

What does this mean guys?I see this in the log file being sent to me by my server...thanks in advance...

Sep 23 11:01:01 server1 amavis[20061]: Virus scanner failure: /usr/bin/sweep (error code: 16777215)
Sep 23 11:01:12 server1 amavis[15548]: Virus scanner failure: /usr/bin/sweep (error code: 16777215)
Sep 23 11:03:55 server1 amavis[30426]: Virus scanner failure: /usr/bin/sweep (error code: 16777215)
Sep 23 11:03:55 server1 amavis[18275]: Virus scanner failure: /usr/bin/sweep (error code: 16777215)







Ryan Kerwin Macrohon
MIS
Hitachi Industrial Machinery Phil. Corp.
kerwin@???
046 - 4021112