Differences

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--- gmail_as_a_relay_on_linux [2020/09/30 16:07] – juckins
+++ gmail_as_a_relay_on_linux [2025/03/20 19:55] (current) – juckins
@@ Line 1: / Line 1: @@
-===== Using Gmail as a Relay on CentOS Linux =====
+==== Using Gmail as a Relay on RedHat Linux (non 2-factor auth) ====
-Required packages if CentOS6 6.7: \\
+RockyLinux 9 Notes:
-  * postfix (tested version 2:2.6.6-6.el6_5)
+  * (Nothing special noted)
-  * ca-certificates.noarch (tested version 2015.2.4-65.0.1.el6_6)
+CentOS 8 Notes:
+  * (Nothing special noted)
 Required packages if CentOS7 7.2.1511: \\
@@ Line 21: / Line 23: @@
 Directions [[http://mhawthorne.net/posts/postfix-configuring-gmail-as-relay.html|based on this page by Matthew Hawthorne]]: \\
-. If installed, make sure /etc/ssmtp/ssmtp.conf is the distro version (no changes, is not needed on CentOS 7 and not existent on CentOS8)
+. If it exists, make sure /etc/ssmtp/ssmtp.conf is the distro version with no changes
 . Make a backup copy of /etc/postfix/main.cf
@@ Line 28: / Line 30: @@
 <code>
-# sets gmail as relay
+# Sets gmail as relay
 relayhost = [smtp.gmail.com]:587
-# use tls
+# Use tls
 smtp_use_tls=yes
-# use sasl when authenticating to foreign SMTP servers
+# Use sasl when authenticating to foreign SMTP servers
 smtp_sasl_auth_enable = yes
-# path to password map file
+# Path to password map file
 smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
+# NOTE: This section *should* be configured properly in CentOS8 and RockyLinux9 by default
 # list of CAs to trust when verifying server certificate
 #smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
@@ Line 45: / Line 48: @@
 smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
-# eliminates default security options which are incompatible with Gmail
+# Eliminates default security options which are incompatible with Gmail
 smtp_sasl_security_options =
-# add debugging
+# Modify debugging (make sure to comment pre-existing entries)
 debug_peer_list=smtp.gmail.com
 debug_peer_level=3
 </code>
-. Add your own Gmail credentials to /etc/postfix/sasl_passwd \\
+. Add your own Gmail credentials to /etc/postfix/sasl_passwd (the password needs to be a Google App-Specific password to get around the 2FA requirement \\
 <code>
-[smtp.gmail.com]:587  username:password
+[smtp.gmail.com]:587  [email protected]:GMAIL_APP_PASSWORD
 </code>
@@ Line 86: / Line 89: @@
 </code>
-. Edit ~/.muttrc for each user as appropriate: \\
+. Add these lines to the global /etc/Muttrc.local (easier than adding it to each user's $HOME/.muttrc): \\
 <code>
-#set from = $USER@$HOSTNAME
+set from = "`whoami`@`hostname`"
-#set from = username@HOSTNAME_OR_ALIAS.domain
+set realname = "`whoami`@`hostname`"
-#set realname="juckins@lightning"
-set realname="$USER@$HOSTNAME" (works in CENTOS7, mutt-1.5.21-26.el7.x86_64 but *not* via cron sending)
 </code>
@@ Line 100: / Line 100: @@
 mutt -s "Test1" [email protected] </dev/null
 </code>
-or to send a message without using a separate file:
+or to send a message without using a separate file but note mailx is probably not looking at .muttrc:
 <code>
 echo 'It works' | mailx -s 'Test message' [email protected]
+</code>
+or
+<code>
+mailx -a test.txt -s "test subject" user@domain < /dev/null
 </code>