Send Mail Using Amazon EC2 Instance


Before we get started, you will need the following:

  • An Amazon EC2 instance running Linux
  • An AWS account with SES enabled
  • A domain name or email address that you want to use as the sender address

Step 1: Install Postfix

Postfix is an open-source mail transfer agent that can be used to send emails from a Linux machine. To install Postfix on your Amazon EC2 instance, run the following command:

sudo yum install postfix

After the installation is complete, edit the Postfix configuration file /etc/postfix/ and add the following lines at the end of the file:

relayhost =
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_use_tls = yes

Replace with the SMTP endpoint of the AWS region you are using. If you are using a different email service provider, replace this with the appropriate SMTP server address.

Step 2: Configure SASL Authentication

Next, you need to configure SASL authentication to allow Postfix to authenticate with SES. Create a new file /etc/postfix/sasl_passwd and add the following line: SES_SMTP_USERNAME:SES_SMTP_PASSWORD

Replace SES_SMTP_USERNAME and SES_SMTP_PASSWORD with your SES SMTP user name and password, respectively. Save the file and run the following commands to create a hash database for Postfix to read:

sudo chmod 600 /etc/postfix/sasl_passwd
sudo postmap /etc/postfix/sasl_passwd

Step 3: Restart Postfix

After completing the previous steps, you need to restart Postfix to apply the changes you made. Run the following command to restart the Postfix service:

sudo service postfix restart

Step 4: Test Email Sending

To test that your Amazon EC2 instance can send emails, you can use the mail command. Run the following command to send a test email:

echo "This is a test email" | mail -s "Test Email"

Replace with the email address you want to send the test email to. If everything is configured correctly, you should receive the test email in a few minutes.

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