The Postfix Guide

-
General Configuration and Administration

Postfix default directories:

/etc/postfix                    [Configuration files and lookup tables]
/usr/libexec/postfix      [Postfix daemons]
/var/spool/postfix        [Queue files]
/usr/sbin                        [Postfix commands]


Starting Postfix the First Time

1. Set hostname properly

Postfix uses a configuration parameter called myhostname, which must be set to the fully qualified hostname of the system Postfix is running on. Once Postfix knows the fully qualified hostname, it can use that hostname to set default values for other important parameters, such as mydomain. If the parameter myhostname is not set, Postfix defaults to the hostname reported by the system itself.

$hostname

#postconf -e myhostname=mail.drbdtest.com


2. Check system aliases database

Make sure that your system’s aliases database is in the correct format.

#newaliases


3. Start the postfix

#postfix start

If Postfix encounters any problems at start up, it reports them to your terminal. After some initial setup, Postfix detaches from the terminal and can no longer report problems to the screen. It will, however, continue to send a lot of information to your system log.


Configuration Files

The directory /etc/postfix contains Postfix configuration files. The two most important files used in the configuration of Postfix are master.cf and main.cf. These files should be owned by, and only writable by, the root user. They should be readable by everyone. Whenever you make changes to these files, you have to reload Postfix for your changes to go into effect:*

# postfix reload

The master daemon is the overall process that controls other Postfix daemons for mail handling. The master.cf file contains a line for each Postfix service or transport.





Comments

Post a Comment

Popular posts from this blog

Cambium cnPilot E400/E410/E500 Configuration Tutorial

-
Image
Basic Connectivity:   Router (Broadband/mikrotik |dhcp enabled) >>> E400/E410/E500 + LAPTOP Cambium (Powered ON) [POE port] >>>> LAPTOP [LAN port] Step 1: Open Cambium controller in the browser. Step 2: After entering in to the site click on the Onboard Device option from Home Tab of Left Panel. Step 3: In the Onboard Option, we will get Claim Device option to adopt a Cambium AP. Step 4: Now we will move to the Cambium AP configuration Part. Below are credentials of default login access of cnpilot E400/E410/E500/E410/E500. IP:192.168.0.1 Command Line Access: Username: admin Telnet: Disabled by default Password: admin SSH: Enabled by default (on standard port: 22) ***We can also use dhcp IP to login to the cnpilot E400/E410/E500. We will get login page. Step 5: We can see several TAB on left panel. On the DashBoard Tab, we will get some overall information. Some are useful for the configuration; some are useful for troubleshoo...
Read more

Disabling Zimbra's AntiSpam, Amavis and AntiVirus filtering

-
 Check whether antispam and antivirus service is enabled currently on server using the given command zmprov -l gs <mail.example.com> | egrep -i 'serviceen|servicein'  The above command will list all the services which are currently installed and enabled on the server. Disable the antivirus and antispam services using the given commands zmprov -l ms <mail.example.com> -zimbraServiceEnabled antispam  zmprov -l ms <mail.example.com> -zimbraServiceEnabled amavis zmprov -l ms <mail.example.com> -zimbraServiceEnabled antivirus  Comment the following line in the file /opt/zimbra/postfix/conf/main.cf content_filter = smtp-amavis:[127.0.0.1]:10024  Restart services on server zmcontrol restart  Confirm that the antispam and antivirus services are disabled with the given command zmprov -l gs <mail.example.com> | egrep -i 'serviceen|servicein'  zmcontrol status 
Read more

Error "Unable to retrive Zimbra GPG key for package validation"

-
From the installation log we see: Executing: /tmp/tmp.mSlzRMclVa/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 9BE6ED79 gpg: requesting key 9BE6ED79 from hkp server keyserver.ubuntu.com gpg: keyserver timed out gpg: keyserver receive failed: keyserver error 1. Open port 11371 11371 tcp,udp hkp OpenPGP HTTP Keyserver 2. Force it to use port 80: gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 9BE6ED79 Ref: https://wiki.zimbra.com/wiki/Error_%22Unable_to_retrive_Zimbra_GPG_key_for_package_validation%22
Read more