How to send mail through Gmail On CentOS 7
How to send mail through Gmail On CentOS 7
Postfix is a flexible mail server that is available on most Linux distribution. Though a full feature mail server, Postfix can also be used as a simple relay host to another mail server, or smart host. This tutorial will describe How to send mail through Gmail On CentOS 7 with Postfix as a relay.
Requirements
CentOS 7 or Red Hat Enterprise Linux 7Valid Gmail or Google App credentials
Install Postfix
Install Postfix, the SASL authentication framework, and mailx are all installed.
yum -y install postfix cyrus-sasl-plain mailx
[root@ip-k8smaster ~]# yum -y install postfix cyrus-sasl-plain mailx
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink | 9.1 kB 00:00:00
* base: d36uatko69830t.cloudfront.net
* epel: mirrors.aliyun.com
* extras: d36uatko69830t.cloudfront.net
* updates: d36uatko69830t.cloudfront.net
base | 3.6 kB 00:00:00
docker-ce-stable
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink | 9.1 kB 00:00:00
* base: d36uatko69830t.cloudfront.net
* epel: mirrors.aliyun.com
* extras: d36uatko69830t.cloudfront.net
* updates: d36uatko69830t.cloudfront.net
base | 3.6 kB 00:00:00
docker-ce-stable
Restart Postfix to detect SASL framework .
systemctl restart postfix
Start Postfix on boot.
systemctl enable postfix
[root@ip-k8smaster ~]# systemctl restart postfix
[root@ip-k8smaster ~]# systemctl enable postfix
[root@ip-k8smaster ~]# systemctl enable postfix
Configure Postfix
Open the /etc/postfix/main.cf and add the following lines to the file.relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
Save the main.cf file and close the editor.smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
Configure Postfix SASL Credentials
Add the Gmail credentials for authentication. Create a "/etc/postfix/sasl_passwd" file and add following line: [smtp.gmail.com]:587 username:password
Replace valid Gmail credentials with username and password values. The sasl_passwd file can now be saved and closed.
Create a Postfix lookup table from the sasl_passwd text file by running the following command.
postmap /etc/postfix/sasl_passwd
Now Restrict access to the sasl_passwd files .
chown root:postfix /etc/postfix/sasl_passwd*
chmod 640 /etc/postfix/sasl_passwd*
Reload the Postfix configuration.chmod 640 /etc/postfix/sasl_passwd*
systemctl reload postfix
Test
Use the mail command to test the relay.echo "This is Manas." | mail -s "message" xxxxx@yyy.com
The destination address should now receive the test message.
If you have issues like " Application-specific password required" , then you need to create app password and provide that in sasl_passwd file.
The logs can be viewed at "/var/log/maillog". The debug level can be increased by adding the following lines to the /etc/postfix/main.cf and restart postfix.
debug_peer_list=smtp.gmail.com
debug_peer_level=3
debug_peer_level=3
Check Postfix Config:
[root@ip-k8smaster ~]# postconf -n
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