postfix email erver configuration

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Some of you use postfix email server and honestly the initial configuration is simple and easy.

Here you go!!

/etc/postfix/main.cf
-------> This is the main configuration file for Postfix.

You can open this configuration file in any of your text editor like nano,vim,vi


******************
myhostname =
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination =
relayhost =
mynetworks =
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all



*******************
This is the section of the configuration file you must focus on.

You need to configure the above sections properly!!

myhostname: This is the hostname of your machine. But don't put the full hostname. If your machine hostname is tes.sample.com you will only use sample.com.

mydestination: This parameter specifies what destinations this machine will deliver locally. The default is:

mydestination = $myhostname localhost.$mydomain localhost

You could also use something like ;

sample.com sample localhost.localdomain localhost

This call is up to you. Either way will work; but the latter line will help to avoid mailloops.

mynetworks
: This line is a bit trickier. This entry will define authorized destinations that mail can be relayed from. You would think that adding your subnet here would work. Sometimes that is the case; sometimes not. You could go with a mynetworks entry that looks like:

mynetworks = 127.0.0.1/8

The above entry is a safe entry and defines local machines only.

You could also have an entry that looks like:

mynetworks = 127.0.0.1/8 XX.XX.XX.XX/24


The above entry would authorize local machines and your internal network addresses.

I have found, however, that the above entries will cause problems with relaying due to constantly changing dhcp addresses. Because of this I have used the following, specialized entry which will avoid this issue:

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128

Now, if your mail server serves up mail to your entire domain, you will need to add another entry to that section above. That entry is:

mydomain = sample.com

Again, as in all configurations above, the sample.com will be substituted with your real domain.

Now, save that configuration file and restart your mail server with the command:

sudo /etc/init.d/postfix reload

You are good to go now.
 
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