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Configuring Postfix to use my domain

Posted February 18, 2017 3.2k views
DigitalOceanApplicationsUbuntu 16.04

I’ve got a postfix config that’s sending emails just fine, except that the sender address is root@lamp-512mb-lon1-01.localdomain, which isn’t using my domain.

The config file looks like the following:

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = lamp-512mb-lon1-01.localdomain
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, skytracker.co, lamp-512mb-lon1-01.localdomain, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_protocols = all
inet_interfaces = loopback-only

and /etc/mailname contains the domain that I would like to use to send emails from.

The command that I’m testing my email sending from is:

echo “This is the body of the email” | mail -s “This is the subject line” xyz@hotmail.co.uk

Any help would be appreciated!

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ryankr1
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ryankr1
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3 answers
jtittle1 February 18, 2017

@ryankr1

The line in your configuration that looks like:

myhostname = lamp-512mb-lon1-01.localdomain

… is why you’re seeing that :-). That should be your actual hostname (mail.yourdomain.com) or your domain itself (yourdomain.com).

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  • ryankr1 February 19, 2017

    Thanks for your response!

    Okay so I’ve changed that to:

    smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = skytracker.co
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, skytracker.co, lamp-512mb-lon1-01.localdomain, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_protocols = all
inet_interfaces = loopback-only

    I reset postfix with:

    sudo systemctl restart postfix

    and sent an email with the same command.

    Unfortunately I’m still seeing the sender address as: root@lamp-512mb-lon1-01.localdomain

    Any other ideas?

    Reply Report
ryankr1 February 27, 2017

@jtittle any other ideas?

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valterekholm1 August 6, 2019

Hello. I had the same issue, and I found out…
https://www.digitalocean.com/community/questions/system-has-configured-manage_etc_hosts-as-true

By the way, I’ve Ubuntu.

I solved it by adding to the file /etc/cloud/cloud.cfg

manageetchosts: False

And editing /etc/hosts

After the
“127.0.1.1” I added myhostname.swe just

Also, I had edited /etc/postfix/main.cf (myhostname= and myorigin=)

Then I restarted (server and) postfix

sudo systemctl restart postfix

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