Download VPOP3 User Guide - Paul Smith Computer Services

VPOP3 – Your email post office
Creating an External Router
External Router Examples
Virus check incoming message attachments
How to Virus Check Incoming Attachments
You can make VPOP3 check downloaded messages for viruses by using an
External Router program. This is a program, batch file or script which is run
whenever a message is downloaded from your ISP using the POP3 protocol.
We have described here an example of how you would set up an external router
to use McAfee VirusScan to scan all incoming message attachments.
You could modify this if you wanted to use another virus scanner - but note that
the virus scanner must be able to be run from the command line to check specific
files or directories and should return different result codes depending on
whether a virus is detected or not (a lot of modern virus scanners are not capable
of being controlled from the command line, so check first!)
This example assumes the following directory structure:
c:\Windows (Windows 95)
c:\Program Files\McAfee\VirusScan\scan.exe
c:\Program Files\VPOP3\VPOP3.EXE
c:\Program Files\VPOP3\vscan.bat
c:\Program Files\VPOP3\VScan\unmime.exe
c:\Program Files\VPOP3\VScan\uud.exe
c:\Program Files\VPOP3\Vscan\Files\
(In the VPOP3\VScan directory, you will need two utilities called unmime and
uud. We obtained these from a shareware toolset called ESS-Code 7.5 for DOS.)
In the VPOP3 Extensions window define the External Router to be:
c:\windows\command.com /c vscan.bat (If you are running Windows NT, use
c:\winnt\cmd.exe instead of command.com).
VSCAN.BAT Listing
@echo off
REM Make sure the required directories exist
if not exist vscan\files\*.* md vscan\files
REM Change to the temporary files directory because unmime
and uud
REM unpack to the current directory
cd vscan\files
REM Unpack all mime & uuencoded attachments
..\unmime ..\..\routing.dat >nul
..\uud ..\..\routing.dat >nul
REM Change back to the VPOP3 directory
cd ..\..
REM Do Scan
“c:\program files\mcafee\virusscan\scan” vscan\files\*.* /all
/nobeep /noexpire /nomem >nul
REM McAfee VirusScan returns a result code of 0 if there are
no viruses or
Page 192
User Manual
v 1.3.0 May 1999