CPanel + Exim + User Level Filtering

Nov 18, 2008

whether our webhost has their configuration messed up, or if this is not genuinely possible with cpanel + exim + shared hosting.

Our email server is hosted with the web host, and what we want to do is to not allow certain users to be able to receive (And send) outgoing email to non-local domains e.g. they should only be able send and receive within our hosted domain, .

Now, we've tried doing this using cpanel's user level filters and have setup the following:

If Field To does not contain OR
If Field From does not contain


Fail with message.

We've tested these filters using combinations and they seem to be working as far as we can see on cpanel (it has the filter testing feature)

Now this works for people sending emails into our domain e.g. someone from hotmail tries sending emails to a user, and it bounces back.

But people from inside the domain can send emails to other domains even when they give valid results on the cpanel filter tester.

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Exim Filtering Options In Cpanel

Sep 11, 2008

more specific filtering options in cpanel exactly:

if header from contains 'example' and also header from contains 'example2' then discard

in cpanel it just has one word or phrase i need the filter to check for 2 words in any order in the from field

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Exim/Cpanel No Such User Here

Jun 25, 2008

I'm having an issue with email generated from a website contact form. The email is being sent from the website via php. The issue is that the email address that it is being sent to is a domain/website that is also on cpanel. It is trying to deliver it to a local account, but the email is acutally on a third party system outside of cpanel. Does anyone know anyway for exim to not try and deliver locally?

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May 29, 2007

I would like to filter some special mails of mine through an external PHP script. Is this possible? I would like to call the php file everytime a mail arrives, and the php file will make changes to that mail text and save in inbox.

My PHP file is ready but i need to make this work in Exim.

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Exim Filtering Jpg Attachments

Apr 6, 2007

Exim logs:

2007-04-05 15:07:45 1HZYFE-0003DC-Rr <= H=( []:42573 I=[]:25 P=esmtp S=9925 id=000801c777be$11815a50$34840ef0$@com T="test" from <> for
2007-04-05 15:07:45 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1HZYFE-0003DC-Rr
2007-04-05 15:07:45 1HZYFE-0003DC-Rr => discarded (system filter)
2007-04-05 15:07:45 1HZYFE-0003DC-Rr Completed QT=1s

This only happens when a 4kb jpeg/jpg attachment is sent. Not sure where its getting caught.

My antivirus.exim file attached

I searched for "jpg" and "jpeg" in that file, nothing showed up.

# Exim filter
## Version: 0.17
#$Id: system_filter.exim,v 1.11 2001/09/19 11:27:56 nigel Exp $

## Exim system filter to refuse potentially harmful payloads in
## mail messages
## (c) 2000-2001 Nigel Metheringham <>
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## GNU General Public License for more details.
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -A copy of the GNU General Public License is distributed with exim itself

## -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
## If you haven't worked with exim filters before, read
## the install notes at the end of this file.
## The install notes are not a replacement for the exim documentation
## -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

## -----------------------------------------------------------------------
# Only run any of this stuff on the first pass through the
# filter - this is an optomisation for messages that get
# queued and have several delivery attempts
# we express this in reverse so we can just bail out
# on inappropriate messages
if not first_delivery

## -----------------------------------------------------------------------
# Check for MS buffer overruns as per BUGTRAQ.
# [url]
# This could happen in error messages, hence its placing
# here...
# We substract the first n characters of the date header
# and test if its the same as the date header... which
# is a lousy way of checking if the date is longer than
# n chars long
if ${length_80:$header_date:} is not $header_date:
fail text "This message has been rejected because it has

an overlength date field which can be used

to subvert Microsoft mail programs

The following URL has further information
seen finish

## -----------------------------------------------------------------------
# These messages are now being sent with a <> envelope sender, but
# blocking all error messages that pattern match prevents
# bounces getting back.... so we fudge it somewhat and check for known
# header signatures. Other bounces are allowed through.
if $header_from: contains ""
fail text "This message has been rejected since it has

the signature of a known virus in the header."
seen finish
if error_message and $header_from: contains "Mailer-Daemon@"
# looks like a real error message - just ignore it

## -----------------------------------------------------------------------
# Look for single part MIME messages with suspicious name extensions
# Check Content-Type header using quoted filename [content_type_quoted_fn_match]
if $header_content-type: matches "(?:file)?name=("[^"]+\.(?:ad[ep]|ba[st]|chm|cmd|com|cpl|crt|eml|exe|hlp|hta|in[fs]|isp|jse?|lnk|md[be]|ms[cipt]|pcd|pif|reg|scr|sct|shs|url|vb[se]|ws[fhc])")"
fail text "This message has been rejected because it has

potentially executable content $1

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."
seen finish
# same again using unquoted filename [content_type_unquoted_fn_match]
if $header_content-type: matches "(?:file)?name=(\S+\.(?:ad[ep]|ba[st]|chm|cmd|com|cpl|crt|eml|exe|hlp|hta|in[fs]|isp|jse?|lnk|md[be]|ms[cipt]|pcd|pif|reg|scr|sct|shs|url|vb[se]|ws[fhc]))"
fail text "This message has been rejected because it has

potentially executable content $1

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."
seen finish

## -----------------------------------------------------------------------
# Attempt to catch embedded VBS attachments
# in emails. These were used as the basis for
# the ILOVEYOU virus and its variants - many many varients
# Quoted filename - [body_quoted_fn_match]
if $message_body matches "(?:Content-(?:Type:(?>\s*)[\w-]+/[\w-]+|Disposition:(?>\s*)attachment);(?>\s*)(?:file)?name=|begin(?>\s+)[0-7]{3,4}(?>\s+))("[^"]+\.(?:ad[ep]|ba[st]|chm|cmd|com|cpl|crt|eml|exe|hlp|hta|in[fs]|isp|jse?|lnk|md[be]|ms[cipt]|pcd|pif|reg|scr|sct|shs|url|vb[se]|ws[fhc])")[\s;]"
fail text "This message has been rejected because it has

a potentially executable attachment $1

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."
seen finish
# same again using unquoted filename [body_unquoted_fn_match]
if $message_body matches "(?:Content-(?:Type:(?>\s*)[\w-]+/[\w-]+|Disposition:(?>\s*)attachment);(?>\s*)(?:file)?name=|begin(?>\s+)[0-7]{3,4}(?>\s+))(\S+\.(?:ad[ep]|ba[st]|chm|cmd|com|cpl|crt|eml|exe|hlp|hta|in[fs]|isp|jse?|lnk|md[be]|ms[cipt]|pcd|pif|reg|scr|sct|shs|url|vb[se]|ws[fhc]))[\s;]"
fail text "This message has been rejected because it has

a potentially executable attachment $1

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."
seen finish
## -----------------------------------------------------------------------

#### Version history
# 0.01 5 May 2000
#Initial release
# 0.02 8 May 2000
#Widened list of content-types accepted, added WSF extension
# 0.03 8 May 2000
#Embedded the install notes in for those that don't do manuals
# 0.04 9 May 2000
#Check global content-type header. Efficiency mods to REs
# 0.05 9 May 2000
#More minor efficiency mods, doc changes
# 0.06 20 June 2000
#Added extension handling - thx to Douglas Gray Stephens & Jeff Carnahan
# 0.07 19 July 2000
#Latest MS Outhouse bug catching
# 0.08 19 July 2000
#Changed trigger length to 80 chars, fixed some spelling
# 0.09 29 September 2000
#More extensions... its getting so we should just allow 2 or 3 through
# 0.10 18 January 2001
#Removed exclusion for error messages - this is a little nasty
#since it has other side effects, hence we do still exclude
#on unix like error messages
# 0.11 20 March, 2001
#Added CMD extension, tidied docs slightly, added RCS tag
#** Missed changing version number at top of file :-(
# 0.12 10 May, 2001
#Added HTA extension
# 0.13 22 May, 2001
#Reformatted regexps and code to build them so that they are
#shorter than the limits on pre exim 3.20 filters. This will
#make them significantly less efficient, but I am getting so
#many queries about this that requiring 3.2x appears unsupportable.
# 0.14 15 August,2001
#Added .lnk extension - most requested item :-)
#Reformatted everything so its now built from a set of short
#library files, cutting down on manual duplication.
#Changed w in filename detection to . - dodges locale problems
#Explicit application of GPL after queries on license status
# 0.15 17 August, 2001
#Changed the . in filename detect to S (stops it going mad)
# 0.16 19 September, 2001
#Pile of new extensions including the eml in current use
# 0.17 19 September, 2001
#Syntax fix

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My provider is using mailfoundry for spam filtering.. but I used IMAP (stored on server) for email.. my problem is that I'm also using a catch-all address and I make up random email names for sites I go to, to check for spam on the incoming side..

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Mar 21, 2007

I found a handful of howto's for dspam, but none of them catered for exim with virtual users. After hunting around, I eventually have it working on a cPanel server, with user authentication for mail users.

My setup:
dspam version 3.6.8, using mysql driver.
exim version 4.
mysql 4.1
CentOS (2.6.9-023stab033.9-enterprise)
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Download the source, configure and compile:

# cd /usr/local/src
# wget
# tar -zxf dspam-3.6.8.tar.gz
# cd dspam-3.6.8
Configure, replacing user/groups with your web-server user (web / apache / nobody), and use your mysql-include / library paths (will need mysql-devel on rh based systems).

# ./configure --prefix=/opt/dspam-3.6.8 --with-local-delivery-agent=/usr/sbin/exim --with-storage-driver=mysql_drv --with-userdir=/var/spool/mail/dspam --with-userdir-owner=nobody --with-userdir-group=nobody --with-dspam-mode=none --with-dspam-owner=nobody --with-dspam-group=nobody --enable-whitelist --enable-spam-delivery --enable-alternative-bayesian --disable-dependency-tracking --enable-virtual-users --with-mysql-includes=/usr/include/mysql --with-mysql-libraries=/usr/lib/mysql/ --with-dspam-home=/opt/dspam-3.6.8/var/dspam
# make && make install
Set up mysql

# mysqladmin -p create dspamdb
# mysql -p
>grant all privileges on dspamdb.* to dspamuser@localhost identified by dspampass;
>flush privileges;
Create tables:

mysql -p dspamdb < /usr/local/src/dspam-3.6.8/src/tools.mysql_drv/mysql_objects_speed.sql
mysql -p dspamdb < /usr/local/src/dspam-3.6.8/src/tools.mysql_drv/virtual_users.sql
Link dspam in opt for easy versioning:

ln -s dspam-3.6.8 /opt/dspam
Copy the web interface files to a web directory:

# cp webui/cgi-bin /opt/dspam -r
# cp webui/htdocs /opt/dspam/

This next step is required for pop3 authentication.
Install perl module Apache::AuthPOP3 - which does apache pop3 authorisation:

perl -MCPAN -e shell
install Apache::AuthPOP3
Next, apache will need mod_perl installed - WHM -> Apache Update will allow you to enable the perl module (I am running it alongside php with no issues).

Then in /usr/local/apache/conf/httpd.conf:

ScriptAlias /dspam/ /opt/dspam/cgi-bin/
Alias /dspam_files/ /opt/dspam/htdocs/
<Directory /opt/dspam/cgi-bin>
Options None
AllowOverride AuthConfig
Order allow,deny
Allow from all
Create .htaccess in /opt/dspam/cgi-bin as follows:

AuthName "Dspam"
AuthType Basic
PerlAuthenHandler Apache::AuthPOP3
PerlSetVar MailHost localhost
Require valid-user
#PerlSetVar UserMap pop3user1=>realname1,pop3user2=>realname2
#Require user pop3user1 pop3user2 pop3user3 pop3user4
there are 2 commented parameters you can set when using POP3 auth - sure its pretty self-explanatory.

Set up admin user (the admin_user must be able to authenticate as a pop user):

#echo "admin_user" >> /opt/dspam/cgi-bin/admins
Create a queuesize script for web user - so dspam can determine how many messages in the queue.

vi /usr/local/bin/eximqsize

/usr/bin/find /var/spool/exim/input/ -type f | wc -l | cut -d" " -f1-

# chmod 4755 /usr/local/bin/eximqsize
# chown nobody /usr/local/bin/eximqsize
Configure web ui, edit /opt/dspam/cgi-bin/

$CONFIG{'MAIL_QUEUE'} = "/usr/local/bin/eximqsize";
$CONFIG{'WEB_ROOT'} = "/dspam_files";
$CONFIG{'LOCAL_DOMAIN'} = "FQDN"; #your servers fully qualified domain name - e.g.
Next, set the default preferences for the system (you need /opt/dspam/bin in your path if you copy and paste this...):

dspam_admin ch pref default trainingMode TEFT
dspam_admin ch pref default spamAction quarantine
dspam_admin ch pref default spamSubject "[SPAM]"
dspam_admin ch pref default enableWhitelist on
dspam_admin ch pref default showFactors off
I would suggest reading the README over dspam to get a full understanding of the permissions required for running of dspam. My permissions were:

# chown nobody:mail /opt/dspam/var/dspam -R
# chown nobody:mail /opt/dspam/etc/ -R

Edit dspam.conf (in /opt/dspam/etc/. I have only listed the parameters I changed here...):

TrustedDeliveryAgent "/usr/sbin/exim -oMr spam-scanned"

Trust: root
Trust: mail
Trust: nobody / httpd #choose 1 - what ever your webserver runs as - `ps axu | grep httpd` to find out

#Use the same details as you did for the "grant all privileges on...." statement in mysql.
MySQLServer /var/lib/mysql/mysql.sock
MySQLUser dspamuser
MySQLPass dspampass
MySQLDb dspamdb
MySQLCompress true

MySQLVirtualTable dspam_virtual_uids
MySQLVirtualUIDField uid
MySQLVirtualUsernameField username
Almost there....
Confirm that mysql is configure to listen on a socket in /etc/my.cnf (or whereever your config file is):

# cat /etc/my.cnf
Now the final step - exim configuration. This is the part that took the longest, hopefully it works for you. Just as I read in the howto's I used for this, please please please dont just copy and paste - you stand a good chance of breaking your mail server if you make changes without understanding. Be warned.

My config file is /etc/exim.conf. This should be edited using the WHM -> Exim Configuration Editor -> Advanced.

#Routers - Add these in the box before virtual_user delivery / user delivery router).
#uncomment the next line to disable dspam for virtual users.
# check_local_user
condition = "${if and {
{!eq {$sender_address_domain}{$domain}}
{!eq {$received_protocol}{local}}
{!eq {$received_protocol}{spam-scanned}}
} }"
headers_add = "X-FILTER-DSPAM: by $primary_hostname on $tod_full"
driver = accept
transport = dspam_spamcheck

## The next 2 routers allow you to forward spam / non-spam to dspam for training (e.g.
# spam-username
driver = accept
local_part_prefix = spam-
transport = dspam_addspam

# nospam-username
driver = accept
local_part_prefix = notspam-
transport = dspam_falsepositive

##Transports - can be added anywhere:
#this adds the spam-scanned protocol header, so when it is passed back to exim after being processed by dspam, it doesnt get stuck in a loop.
driver = pipe
command = "/usr/sbin/exim -oMr spam-scanned -bS"
transport_filter = "/opt/dspam/bin/dspam --stdout --deliver=innocent,spam --user $local_part@$domain"
use_bsmtp = true
home_directory = "/tmp"
current_directory = "/tmp"
user = nobody
group = mail
log_output = true
return_fail_output = true
return_path_add = false
message_prefix =
message_suffix =

driver = pipe
command = "/opt/dspam/bin/dspam --user $local_part@$domain --class=spam --source=error"
home_directory = "/tmp"
current_directory = "/tmp"
user = nobody
group = mail
log_output = true
return_fail_output = true
return_path_add = false
message_prefix =
message_suffix =

driver = pipe
command = "/opt/dspam/bin/dspam --user $local_part@$domain --class=innocent --source=error"
home_directory = "/tmp"
current_directory = "/tmp"
user = nobody
group = mail
log_output = true
return_fail_output = true
return_path_add = false
message_prefix =
message_suffix =

If you have set up authentication correctly as well, then you should be able to open [url] and log in - if you add your login details to the "admins" file, you can configure defaults, etc. It also allows ALL users (with 1 user being an email account) to log in, using

This will not work with suexec enabled!! This is because dspam needs specific permissions, and it is expecting user nobody to access it. If suexec is enabled, you will need to use the default host, and NOT virtual hosts (and even this may not work - testing still required).

Watch exim_mainlog after this - you should pick up what transports and routers are being used.

Dspam can really hammer a system - mysql, cpu and memory usage will go up a bit, especially on busy production servers. Monitor your servers performance.

Other settings: add /opt/dspam/man to MANPATH in /etc/man.config or move dspam man directory to an existing man directory.

This dspam.cgi hack will do a lookup in the cpanel config file to find the domain for any username without a domain, and append it on match (or leave just the username part if nothing is found). This requires unsecuring your system a bit - your http user will need to be able to read /etc/trueuserdomains (either chmod 644 or chown nobody):

#add this just after $CURRENT_USER is set.
if ($CURRENT_USER !~ /@.+./) {
open(TUD, "</etc/trueuserdomains");
while(<TUD>) {
my ($domain, $user) = split(/:/,$_);
$user =~ s/^s*//g;
if ($user eq $CURRENT_USER) {

That should do it

dspam will allow all messages through by default, and will require some training. With this config, users can train using email commands - all they need to do is forward any spam that hits their mailbox to (their own email address with spam- prepended). Unfortunately this does not allow handling of false positives if you are using a "quarantine" policy instead of subject. the web interface comes in handy for this.

I am busy testing a combination of dspam with assp, which seems to be working well - I especially like the greylisting feature of assp and ProtectionBox... Will add to this howto when testing is finish.

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Find User Bandwidth From SSH (CPanel)

May 11, 2009

Does anyone happen to know how to find the current bandwidth usage for users in CPanel via SSH? I found disk space, which is /scripts/dumpquota, but I can't find the bandwidth.

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Email Notifications Whenever User Log's In FTP (CPanel)

Apr 12, 2009

Server configuration:
CENTOS 5.3 x86_64
cPanel 11.24.4-C35075 - WHM 11.24.2 - X 3.9

Is it possible to write a script that will be sending notifications on user e-mail, that is already pre-configured in their account, whenver user will log in to FTP.

Are there any pre-made scripts or if not, any hint's on writing something like that?

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Tracking Down Web Process User In Cpanel

Nov 3, 2009

Recently, there are a lot of "apache" processes hogging my Cpanel server with the default owner "nobody". How could I track the apache process back to which user is using it?

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User Nobody Using All System Memory Cpanel

Apr 16, 2009

I tracked down another issue that I am having with this same server. I login and look at the system and 100% of the swap is used and 99% of the Ram. I look to see who's using it, and the user name is Nobody. What role does this user play in cpanel? Can I disable the user?

UPDATE: It is actually apache doing it.

7044 nobody 0


8.3 /usr/local/apache/bin/httpd -DSSL
2836 nobody 0


0.2 /usr/local/apache/bin/httpd -DSSL
2835 nobody 0


1.8 /usr/local/apache/bin/httpd -DSSL
2838 nobody 0


0.5 /usr/local/apache/bin/httpd -DSSL
2854 nobody 0


0.2 /usr/local/apache/bin/httpd -DSSL
7934 nobody 0


22.8 /usr/local/apache/bin/httpd -DSSL
2839 nobody 0


0.2 /usr/local/apache/bin/httpd -DSSL
2887 nobody 0


24.5 /usr/local/apache/bin/httpd -DSSL
2848 nobody 0


2.7 /usr/local/apache/bin/httpd -DSSL

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CPanel - Limiting IO Mem CPU Per User? Hostgator Like

Nov 16, 2008

I was reading up a thread where hostgator cpanel servers seem to be limiting IO activity per user/account/domain. How can that be achieved?

Any special limitations on a per account basis that I am not aware of?

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Exim Can`t Send E-mails After Cpanel Upgrade

May 2, 2009

we have a freebsd/cpanel box what seems to be trouble prone combination, specially for exim.

After cpanel upgrade, exim simple has stopped. Somehow I managed receiving on this way:

# /etc/init.d/exim start
/libexec/ Shared object "" not found, required by "sendmail"

I checked which perl version is running: perl -v
This is perl, v5.10.0 built for i386-freebsd-64int

then applied:

unix1# ln -s /usr/local/lib/perl5/5.10.*/mach/CORE/ /usr/local/lib
unix1# /etc/init.d/exim start
exim exim antirelaydunix1#

but this solved only half of a problem, now we can receive e-mails, but not send them, what is really frustrating.

Here is the error which cpanel sends on each 5 min:

exim failed @ Fri May 1 16:06:15 2009. A restart was attempted automatically.
Service Check Method: [tcp connect]

Failure Reason: TCP Transaction Log:
<< 220-xxxxxxxxxx.xxxx ESMTP Exim 4.69 #3 Fri, 01 May 2009 16:06:41 +0200 << <<
>> EHLO localhost
<< Hello localhost [] << << << << <<
>> AF9fY3BhbmVsX19zZXJ2aWNlX19hdXRoX19leGltX19Nd2NxU1pyUng1S3R5YTl2enZaV
>> UWXM1WnU=
exim: ** [ != 2]

and I can not find the solution for this almost two days (!), no help for host support either. Closest what I have found on net is this topic:


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