Differences

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--- gmail_as_a_relay_on_linux [2019/05/01 11:25] – juckins
+++ gmail_as_a_relay_on_linux [2026/09/11 08:02] (current) – juckins
@@ Line 1: / Line 1: @@
-===== Using Gmail as a Relay on CentOS Linux =====
+==== Using Gmail as a Relay on RedHat Linux with Gmail app password ====
-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)
-Required packages if CentOS7 7.2.1511: \\
-  * postfix (tested version 2.10.1-6.el7 )
-  * ca-certificates.noarch (tested version 2015.2.4-70.0.el7_1)
-  * cyrus-sasl-plain (tested version 2015.2.6-70.1.el7_2)
-    * Got hint that this is needed from [[http://www.postfix.org/SASL_README.html#client_sasl_policy|Postfix config]]
-  * cyrus-sasl-lib (tested version 2.1.26-20.el7_2)
-Other CentOS 7 Notes:
-  * Best to use this version of mutt: mutt-1.6.2-1.fc22.x86_64.rpm
-    * Otherwise, you may get errors like: Bad IDN in "from": 'tidewater.�'
-  * /etc/resolv.conf may need the 'search' pattern, ex: search attlocal.net
-    * As root, run 'nmtui' to set network parameters
-  * If trouble sending after install, may need to consult [[http://unix.stackexchange.com/questions/109473/after-updating-ssmtp-to-version-2-61-i-cannot-send-mail-via-gmail|this link]]
 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, and it is not needed on CentOS 7)
+. 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 13: @@
 <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
 # Below is provided by ca-certificates package (Mozilla CA root certificate bundle)
-smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
+smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt (note it may also be in /etc/ssl/certs/ca-bundle.crt especially Fedora 43+)
-# 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 72: @@
 </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 83: @@
 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>
@@ Line 111: / Line 98: @@
 [[https://www.digitalocean.com/community/tutorials/how-to-use-gmail-or-yahoo-with-php-mail-function|How To Use Gmail or Yahoo with PHP mail() Function]] \\
 [[https://techjourney.net/update-add-ca-certificates-bundle-in-redhat-centos/|Updating certificates]] (not needed at this point)
+----
+**Old notes**\\
+CentOS 8 Notes:
+  * (Nothing special noted)
+CentOS7 7.2.1511 Notes and Required Packages: \\
+  * postfix (tested version 2.10.1-6.el7 )
+  * ca-certificates.noarch (tested version 2015.2.4-70.0.el7_1)
+  * cyrus-sasl-plain (tested version 2015.2.6-70.1.el7_2)
+    * Got hint that this is needed from [[http://www.postfix.org/SASL_README.html#client_sasl_policy|Postfix config]]
+  * cyrus-sasl-lib (tested version 2.1.26-20.el7_2)
+Other CentOS 7 Notes:
+  * Best to use this version of mutt: mutt-1.6.2-1.fc22.x86_64.rpm
+    * Otherwise, you may get errors like: Bad IDN in "from": 'tidewater.�'
+  * /etc/resolv.conf may need the 'search' pattern, ex: search attlocal.net
+    * As root, run 'nmtui' to set network parameters
+  * If trouble sending after install, may need to consult [[http://unix.stackexchange.com/questions/109473/after-updating-ssmtp-to-version-2-61-i-cannot-send-mail-via-gmail|this link]]