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--- gmail_as_a_relay_on_linux_centos8 [2022/03/18 14:26] – created juckins
+++ gmail_as_a_relay_on_linux_centos8 [2025/03/20 19:55] (current) – juckins
@@ Line 1: / Line 1: @@
-==== GMail as a Relay on Linux CENTOS8 ====
+==== GMail as a Relay on Linux Ubunutu 20.04 LTS and CENTOS8 (with 2-factor auth) ====
 Using Postfix for this solution.
-  dnf install postfix ca-certificates mutt
-  dnf install cyrus-sasl, cyrus-sasl-gssapi, cyrus-sasl-lib, cyrus-sasl-plain
 Follow instructions at https://www.linode.com/docs/guides/configure-postfix-to-send-mail-using-gmail-and-google-workspace-on-debian-or-ubuntu/
+Or see the same at {{ ::sending_emails_using_postfix_from_your_linux_server.pdf|Sending Emails Using Postfix From Your Linux Server}}
   * Will this also break with less sure apps?
@@ Line 12: / Line 11: @@
     * Everything should work OK.
+For CENTOS8:
+  dnf install postfix ca-certificates mutt
+  dnf install cyrus-sasl, cyrus-sasl-gssapi, cyrus-sasl-lib, cyrus-sasl-plain
+  systemctl start postfix
+  systemctl enable postfix
+Next perform the following steps as root:
+  cd /etc/postfix
+  cp main.cf main.cf.distro
+  mkdir /etc/postfix/sasl
+  cd /etc/postfix/sasl
+  vi sasl_passwd
+Add this line:
+  [smtp.gmail.com]:587 [email protected]:password
+  postmap /etc/postfix/sasl/sasl_passwd
+  chown root:root /etc/postfix/sasl/sasl_passwd /etc/postfix/sasl/sasl_passwd.db
+  chmod 0600 /etc/postfix/sasl/sasl_passwd /etc/postfix/sasl/sasl_passwd.db
+  vi /etc/postfix/main.cf
+Comment out this line:
+  #smtp_tls_security_level = may
+Now wdd to the end of the main.cf file:
+  # Local Edits
+  relayhost = [smtp.gmail.com]:587
+  # Enable SASL authentication
+  smtp_sasl_auth_enable = yes
+  # Disallow methods that allow anonymous authentication
+  smtp_sasl_security_options = noanonymous
+  # Location of sasl_passwd
+  smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
+  # Enable STARTTLS encryption
+  smtp_tls_security_level = encrypt
+  # Location of CA certificates
+  smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
+Restart postfix:
+  systemctl restart postfix
+Send test message:
+  mutt -s "Test" [email protected] </dev/null