The Postfix Home Page is http://www.postfix.org/ and Wietse Zweitze Venema is the creator.
practicehabits.net is on Google's G Suite and everything has been great so far. My task is setting up a separate SMTP server for sending marketing emails ONLY.
Install and configure postfix, opendkim, and opendmarc on an existing Arch Linux VM running on CloudCone.
- Install Postfix
- Configure Postfix
- Update SPF DNS text record
- Install OpenDKIM
- Configure OpenDKIM
- Add new DKIM DNS text record
- Install OpenDMARC
- Configure OpenDMARC
- Update DMARC DNS text record
- Verify
Install Postfix
$ pacman -Sy postfix
Configure Postfix
Postfix configuration file: /etc/postfix/main.cf
[tuyen@1 ~]$ grep ^[^#] /etc/postfix/main.cf
compatibility_level = 2
queue_directory = /var/spool/postfix
command_directory = /usr/bin
daemon_directory = /usr/lib/postfix/bin
data_directory = /var/lib/postfix
mail_owner = postfix
myhostname = mx1.practicehabits.net
mydomain = practicehabits.net
myorigin = $mydomain
unknown_local_recipient_reject_code = 550
alias_maps = hash:/etc/postfix/aliases
alias_database = $alias_maps
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/bin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /etc/postfix
readme_directory = /usr/share/doc/postfix
inet_protocols = ipv4
meta_directory = /etc/postfix
shlib_directory = /usr/lib/postfix
smtpd_milters = unix:/run/opendkim/opendkim.sock, unix:/run/opendmarc/opendmarc.sock
non_smtpd_milters = unix:/run/opendkim/opendkim.sock, unix:/run/opendmarc/opendmarc.sock
milter_default_action = accept
[tuyen@1 ~]$
Update SPF DNS text record
Add SMTP server's IP Address to existing SPF DNS text record.
v=spf1 ip4:173.82.212.40 include:_spf.google.com -all
Install OpenDKIM
$ sudo pacman -Sy opendkim
Configure OpenDKIM
$ sudo mkdir /run/opendkim $ sudo chown opendkim:postfix /run/opendkim
Generate key pair for OpenDKIM
$ opendkim-genkey -r -s opendkim -b 2048 -d practicehabits.net
Using content in generated opendkim.txt file to create DKIM DNS text record
OpenDKIM configuration file: /etc/opendkim/opendkim.conf
[tuyen@1 ~]$ sudo grep ^[^#] /etc/opendkim/opendkim.conf [sudo] password for tuyen: Domain practicehabits.net KeyFile /etc/opendkim/opendkim.private Selector opendkim Socket unix:/run/opendkim/opendkim.sock Syslog Yes UMask 002 UserID opendkim:postfix [tuyen@1 ~]$
Add new DKIM DNS text record
Create a new DNS txt record for newly created DKIM selector.
Install OpenDMARC
$ sudo pacman -Sy opendmarc
Configure OpenDMARC
$ sudo mkdir /run/opendmarc $ sudo chown opendmarc:postfix /run/opendmarc
OpenDMARC configuration file: /etc/opendmarc/opendmarc.conf
[tuyen@1 ~]$ sudo grep ^[^#] /etc/opendmarc/opendmarc.conf AuthservID HOSTNAME IgnoreAuthenticatedClients true Socket unix:/run/opendmarc/opendmarc.sock SPFSelfValidate true UMask 002 [tuyen@1 ~]$
Verify
echo "Test: setup postfix, opendkim, and opendmarc" | mail -s "Verify: postfix, opendkim, opendmarc" username@gmail.com