To configure the Amazon Web Services Simple Email Service (SES) with the Postfix Mail Transfer Agent (MTA) on a FreeBSD system, you will need to do the following:
pkg package manager:# pkg install postfix
To configure Postfix, edit the file /usr/local/etc/postfix/main.cf and set the myhostname and myorigin parameters to the hostname and domain of your server, respectively. You may also need to set the inet_interfaces parameter to all to listen on all available network interfaces.
Create an IAM user and group in your AWS account with the necessary permissions to send email through SES. You can do this through the AWS Management Console or using the AWS CLI.
Set up a sending domain in SES. You will need to verify the domain you want to use to send email through SES and set up DNS records for the domain.
Set up the credentials for your IAM user in Postfix. You will need the access key ID and secret access key for the IAM user you created in step 2. You can set these values in the main.cf file using the smtp_sasl_user_name and smtp_sasl_passwd parameters, respectively. You can also set the smtp_sasl_security_options parameter to noanonymous to enable SMTP authentication.
Set up Postfix to use SES as the default SMTP relay. You can do this by adding the following line to the main.cf file:
relayhost = email-smtp.us-east-1.amazonaws.com
You may also need to set the smtp_use_tls parameter to yes to enable Transport Layer Security (TLS).
# service postfix restart
sendmail command:echo "This is a test email" | sendmail recipient@example.com
If the email is successfully sent, you have successfully configured Postfix to use SES as the default SMTP relay.
For more information about configuring Postfix to use SES, you can refer to the Postfix documentation and the AWS SES documentation.