hostgliders
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- Feb 17, 2017
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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.
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.
