Configuring Postfix to use my domain

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,, lamp-512mb-lon1-01.localdomain, localhost.localdomain, localhost
relayhost =
mynetworks = [::ffff:]/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”

Any help would be appreciated!

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Hello. I had the same issue, and I found out…

By the way, I’ve Ubuntu.

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

manage_etc_hosts: False

And editing /etc/hosts

After the “” I added myhostname.swe just

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

Then I restarted (server and) postfix

sudo systemctl restart postfix

@jtittle any other ideas?


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 ( or your domain itself (