HOWTO: Change Postfix configuration for Threat Emulation MTA

How to change Postfix configuration for Threat Emulation MTA

Solution ID	sk109699
Product	Threat Emulation, Threat Extraction, Anti-Spam
Version	R77, R77.10, R77.20, R77.30, R80.10

Connect to command line on Security Gateway (over SSH, or console).
Log in to Expert mode.
Create the $FWDIR/conf/mta_postfix_options.cf file:[Expert@HostName]# touch $FWDIR/conf/mta_postfix_options.cf
Edit the $FWDIR/conf/mta_postfix_options.cf file:[Expert@HostName]# vi $FWDIR/conf/mta_postfix_options.cf
Add the desired parameters. Refer to official Postfix Configuration Parameters page.
Save the changes in the file and exit from Vi editor.
In SmartDashboard, install the Threat Prevention policy.

Mail box size and Message size:Add the following lines to the ‘$FWDIR/conf/mta_postfix_options.cf‘ file:
```
mailbox_size_limit = 51200000
message_size_limit = 10240000
```
These are the default values (in bytes). Set the relevant values according to client needs.

Important Note: Must make sure that ‘mailbox_size_limit‘ > ‘message_size_limit‘.
Security Gateway’s hostnameThe default Security Gateway’s hostname, as it appears in mail headers and SMTP protocol connections, is the name of the Security Gateway’s object in the Smartdashboard.To change the Security Gateway’s hostname in mail headers and SMTP protocol connections, add the following line to the ‘$FWDIR/conf/mta_postfix_options.cf‘ file:myhostname=DESIRED_NAME

How to monitor and manage Postfix queue:Refer to relevant manual pages listed in the “Related documentation” section.

Action	Command
Show current queue	[Expert@HostName:0]# /opt/postfix/usr/sbin/postqueue -c /opt/postfix/etc/postfix/ -p
Show one mail from queue: (5632E28B0044 is an example Queue ID from the current queue)	[Expert@HostName:0]# /opt/postfix/usr/sbin/postcat -c /opt/postfix/etc/postfix/ -q 5632E28B0044 \| less
Attempt immediate delivery of queue content	[Expert@HostName:0]# /opt/postfix/usr/sbin/postqueue -c /opt/postfix/etc/postfix/ -f
Delete one message from queue: (5632E28B0044 is an example Queue ID from the current queue)	[Expert@HostName:0]# /opt/postfix/usr/sbin/postsuper -c /opt/postfix/etc/postfix/ -d 5632E28B0044
Delete all messages in queue	[Expert@HostName:0]# /opt/postfix/usr/sbin/postsuper -c /opt/postfix/etc/postfix/ -d ALL
Show postfix configuration	[Expert@HostName:0]# /opt/postfix/usr/sbin/postconf -c /opt/postfix/etc/postfix/
Get postfix version	[Expert@HostName:0]# /opt/postfix/usr/sbin/postconf -c /opt/postfix/etc/postfix/ \| grep mail_version
Restart postfix	[Expert@HostName:0]# /opt/postfix/usr/sbin/postfix -c /opt/postfix/etc/postfix reload

Connect to command line on Security Gateway (over SSH, or console).
Log in to Expert mode.
Backup the /opt/postfix/etc/postfix/main.cf file:[Expert@HostName]# cp /opt/postfix/etc/postfix/main.cf /opt/postfix/etc/postfix/main.cf_ORG
Edit the /opt/postfix/etc/postfix/main.cf file:[Expert@HostName]# vi /opt/postfix/etc/postfix/main.cf
Add the desired parameters. notify_classes = bounce, resource, softwareRefer to official Postfix Configuration Parameters page.
Save the changes in the file and exit from Vi editor.
In SmartDashboard, install the Threat Prevention policy.

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