How to Email to gmail from cmd

To set the correct SMTP server and port in RHEL terminal, you need to configure the postfix service, which is the default SMTP server for RedHat or CentOS systems. Postfix is a program that can send and receive emails using the SMTP protocol. You can install it by running `sudo yum install postfix` on your terminal¹.

To configure postfix, you need to edit the `/etc/postfix/main.cf` file and append or modify the following parameters¹:

- `myhostname`: This is the hostname of your server, such as `example.com`.
- `relayhost`: This is the IP address or hostname of the relay server that you want to use to send emails, such as `[smtp.gmail.com]:587`.
- `smtp_use_tls`: This is a boolean value that indicates whether to use TLS encryption for SMTP connections. Set it to `yes` if your relay server supports TLS, or `no` otherwise.
- `smtp_sasl_auth_enable`: This is a boolean value that indicates whether to use SASL authentication for SMTP connections. Set it to `yes` if your relay server requires authentication, or `no` otherwise.
- `smtp_sasl_password_maps`: This is a file that contains the username and password for your relay server, such as `hash:/etc/postfix/sasl_passwd`.
- `smtp_sasl_security_options`: This is a string that specifies the security options for SASL authentication. Set it to `noanonymous` to prevent anonymous authentication.

For example, if you want to use Gmail as your relay server, you can use the following settings²:

myhostname = example.com
relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

You also need to create the /etc/postfix/sasl_passwd file and enter your Gmail username and password in the following format²:

[smtp.gmail.com]:587 username@gmail.com:password

Then, you need to run the following commands to update the postfix configuration and restart the service¹:

sudo postmap /etc/postfix/sasl_passwd
sudo chmod 600 /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db
sudo systemctl restart postfix

To verify that your postfix service is working properly, you can use the s-nail command to send a test email from your terminal. For example:

echo "This is a test email" | s-nail -s "Test" recipient@example.com

You should receive the email in your recipient’s inbox shortly. If not, you can check the `/etc/postfix/sasl_passwd` file for any errors or warnings.

Thankyou