1. Edit the file /etc/MailScanner/reports/en/inline.sig.txt and /etc/MailScanner/reports/en/inline.sig.html and replace it with your own message.

2. Edit the file /etc/MailScanner/MailScanner.conf and update the line below.

Sign Clean Messages = /etc/MailScanner/rules/signing.rules

3. Create the file /etc/MailScanner/rules/signing.rules and add the lines below.

From:      *@acme.local  yes
FromOrTo:  default       no

Replace acme.local with your own domain name.

4. Restart the MailScanner service. Learn how to restart services.

5. You should now see your disclaimer message on outbound emails.

To minimize the resource requirements, a more efficient Perl ClamAV module, specified by setting Virus Scanners = clamavmodule in the MailScanner configuration file and installing the necessary Perl modules, was developed.

But this new feature, activated by setting Virus Scanners = clamd in the MailScanner configuration file, bypasses the external program clamscan and Perl ClamAV module and communicates directly with the Clam AntiVirus daemon (clamd) giving a lighter resource usage and better performance.

The MailScanner and ClamAV integration guide has been updated to utilize this new feature.

Here are the installation guides for the above components.

• How to install Postfix SMTP Server
• How to install Clam Anti-virus (ClamAV)
• How to install MailScanner

SpamAssassin is included in Red Hat Enterprise Linux 5 and CentOS 5 and it’s ready to go out of the box. Just add it using the Package Manager tool if you haven’t done so during installation.

Configuring MailScanner

1. Edit the file /etc/MailScanner/MailScanner.conf

%org-name% = your organization name
%org-long-name% = your full organization name
Run As User = postfix
Run As Group = postfix
Incoming Queue Dir = /var/spool/postfix/hold
Outgoing Queue Dir = /var/spool/postfix/incoming
Incoming Work Group = clamav
Incoming Work Permissions = 0640
MTA = postfix
Virus Scanners = clamd
Clamd Socket = /var/run/clamav/clamd.sock
Use SpamAssassin = yes
SpamAssassin User State Dir = /var/spool/MailScanner/spamassassin

2. Click Applications and click File Browser to launch the File Browser window and go to the /var/spool/MailScanner directory.

3. In the File Browser window, click File and click Create Folder. Name the new folder spamassassin.

4. Recreate the incoming folder to ensure the permission of the contents are set properly. Then right click on the folder incoming and click Properties.

5. In the Properties window, click the Permissions tab. In the Permissions page, set the Owner as postfix and its Folder Access as Create and delete files. Set the Group as clamav and its Folder Access as Access files. Finally, set the Folder Access of Others as None. Click Close when you are done. Repeat this for the quarantine and spamassassin folders.

6. From a terminal window, type in

ln -s /usr/bin/freshclam /usr/local/bin/freshclam

MailScanner will be looking for freshclam in the /usr/local/bin directory so we’ll create a symbolic link to it in that directory.

Integrating MailScanner into Postfix

1. Edit the file /etc/postfix/main.cf and remove the # in front of the line below

header_checks = regexp:/etc/postfix/header_checks

2. Edit the file /etc/postfix/header_checks and add the line below to the bottom of the file

/^Received:/ HOLD

This will now place all incoming mail into the holding area until released by MailScanner.

3. MailScanner should now be the one to start the Postfix service. Stop the Postfix service and start the Clamd and MailScanner service in that order. Learn how to stop and start services here.

4. Test if Postfix is still working. See Test Postfix using Telnet.

If you encounter any problems, check the log file at /var/log/maillog.

Congratulations

Congratulations, your mails are now checked for spam and viruses. Each mail you send or receive will now contain the lines below to indicate that MailScanner is doing its job.

This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

The English language message templates used in MailScanner is stored in /etc/MailScanner/reports/en and can even be configured to add a disclaimer message to outgoing mails.

The installation requires some packages found in RPMforge so make sure it is available in your system. Learn how to add the RPMforge repository.

Getting MailScanner

1. Click the globe icon at the top near the System menu to launch the Firefox web browser.

 

If an error occurs, you probably did not install the Graphical Internet package. You can add it now using the Package Manager tool.

2. In the address box, type in http://www.mailscanner.info/downloads.html and press Enter. Download the stable version for RedHat, Fedora and Mandrake Linux.

Installing MailScanner

1. The MailScanner source code should now be on your desktop. Right click the newly downloaded file and click Extract Here.

2. After extracting, a MailScanner folder should be found on your Desktop. Right click the MailScanner folder and click Open in Terminal.

3. In the terminal window, type in all the command below (in one line) to install the required Perl modules from the RPMforge repository.

yum install perl-Archive-Zip 
perl-DBI
perl-DBD-SQLite
perl-Filesys-Df 
perl-Net-CIDR perl-OLE-Storage_Lite 
perl-Sys-Hostname-Long

4. Finally, type in the command below to install MailScanner.

yum install --nogpgcheck mailscanner*

1. In the Terminal window, type in the commands below.

perl -MCPAN -e shell

This will activate the interactive mode for locating, download and building perl modules from CPAN sites. CPAN stands for Comprehensive Perl Archive Network. CPAN sites contains a large collection of Perl softwares and documentations.

If this is your first time to issue this command, you will be asked to set it up first. Don’t worry, all the setup options has usable default values except the geographic location option. Just hit the Enter key until you read the geographic location option and then select the location closest to you.

install Parse::RecDescent
install Inline
install Mail::ClamAV

2. Edit the file /etc/MailScanner/MailScanner.conf. Find the key below and change it as follows

Virus Scanners = clamavmodule

3. Restart the MailScanner service. Learn how to restart services here.

4. Test if Postfix is still working. See Test Postfix using Telnet.

Here are the installation guides for the above components.

• How to install Postfix SMTP Server
• How to install Clam Anti-virus (ClamAV)
• How to install MailScanner

SpamAssassin is included in CentOS 4 and ready to go out of the box. Just add it using the Package Management tool if you haven’t done so during CentOS installation. SpamAssassin is located in the Mail Server package.

Configuring MailScanner

1. Edit the file /etc/MailScanner/MailScanner.conf

%org-name% = your organization name
%org-long-name% = your full organization name
Run As User = postfix
Run As Group = postfix
Incoming Queue Dir = /var/spool/postfix/hold
Outgoing Queue Dir = /var/spool/postfix/incoming
MTA = postfix
Virus Scanners = clamd
Clamd Socket = /tmp/clamd.socket
Use SpamAssassin = yes
SpamAssassin User State Dir = /var/spool/MailScanner/spamassassin

2. Click Applications and click File Browser to launch the File Browser window and go to the /var/spool/MailScanner directory.

3. In the File Browser window, click File and click Create Folder. Name the new folder spamassassin.

4. Right click on the folder incoming and click Properties.

5. In the Properties window, click the Permissions tab. In the Permissions page, set the File owner as postfix, the File group as postfix and check only the Owner Read, Write and Execute. Click Close when you are done. Repeat this for the quarantine and spamassassin folders.

Integrating MailScanner into Postfix

1. Edit the file /etc/postfix/main.cf and remove the # in front of the line below

header_checks = regexp:/etc/postfix/header_checks

2. Edit the file /etc/postfix/header_checks and add the line below to the bottom of the file

/^Received:/ HOLD

This will now place all incoming mail into the holding area until released by MailScanner.

3. MailScanner should now be the one to start the Postfix service. Stop the Postfix service and start the MailScanner service in that order. Learn how to stop and start services here.

4. Test if Postfix is still working. See Test Postfix using Telnet.

Congratulations

Congratulations, your mails are now checked for spam and viruses. Each mail you send or receive will now contain the lines below to indicate that MailScanner is doing its job.

This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

Getting MailScanner

1. Click the globe icon at the top near the Actions menu to launch the Firefox web browser.

 

If an error occurs, you probably did not install the Graphical Internet package. You can add it now using the Package Management tool.

2. In the address box, type in http://www.mailscanner.info/downloads.html and press Enter. Download the stable version for RedHat, Fedora and Mandrake Linux.

Building and Installing MailScanner

1. The MailScanner source code should now be on your desktop. Right click the newly downloaded file and click Extract Here.

2. After extracting, a MailScanner folder should be found on your Desktop. Double click the MailScanner folder to open it.

3. Next, double click the file install.sh. On the Run or Display window, select Run in Terminal. This will now build and install MailScanner. This will take a while so just wait until the Terminal window disappears.