RootForum Community

Filtering attachments out of email using renattach 1.2.1 with procmail on SuSE Openexchange Server 4


GET SOFTWARE
Download source file:
http://www.pc-tools.net/files/unix/rena ... 2.1.tar.gz

untar and install source:
tar -zxvf renattach-1.2.1.tar.gz
cd renattach-1.2.1
./configure

make
make install

This puts executable renattach in /usr/local/bin
and puts config file renattach.conf.ex in /usr/local/etc

Configure renattach.conf.ex to your liking and save as renattach.conf
************************************************************************************

CONFIGURE PROCMAIL

Our postfix main.cf does not include the line:
mailbox_command= /path/to/procmail
and that seems to be fine.

vi /etc/imap/procmailrc

at the bottom of the file but not before the last "sendmail" command add the lines(options -b=badlist mode -d=delete attachment)

:0 wf
| /usr/local/bin/renattach -b -d

save changes to /etc/imap/promailrc

postfix reload
(this was not necessary but did it just for giggles)
********************************************************************************************

CURRENT CONFIGURATION

In renattach.conf this is our current goodlist:
goodlist = DOC, PDF, RTF, SXC, SXW, TXT, ZIP

and badlist
badlist = ADE, ADP, BAS, BAT, CHM, CMD, COM, CPL, CRT, EML, EXE
badlist = HLP, HTA, HTM, INF, INS, ISP, JS, JSE, LNK, MDB
badlist = MDE, MSC, MSH, MSI, MSP, MST, NWS, OCX, PCD, PIF, REG
badlist = SCR, SCT, SHB, SHS, URL, VB, VBE, VBS, WSC, WSF, WSH

***********************************************************************************************

ERRORS

If the file is sent from inside the county to inside the county email server the email will be delivered after
renattach has deleted the attachment and attached a blankfile called originalname.bad

At this point if the file is sent from the outside it will be returned to sender with this message:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

mail@domain.tld
This message has been rejected because it has
a potentially executable attachment "the_message.scr"
This form of attachment has been used by
recent viruses or other malware.
If you meant to send this file then please
package it up as a zip file and resend it.