Dynamically Customize the 'From' Address in Email Templates

This article describes how to dynamically modify the 'From' address used in Email Templates and the limitations of this method.

• Email Templates

It is possible to include common variables using the Liquid syntax. For example, use application.client_metadata.KeyValueHere for custom values on a per-application basis. It is not possible to set the entire ‘From’ field to such a variable.  

• For example, {{application.name}} will not work, but {{application.name}}@[invalid URL removed] will.

Customers can also use their own custom provider and handle the email sending flow entirely using the "onExecuteCustomEmailProvider" action.

• Example with Amazon Simple Email Service (SES):

  exports.onExecuteCustomEmailProvider = async (event, api) => {
    onst client = new SESClient({
      credentials: {
        accessKeyId: event.secrets.AWS_ACCESS_KEY_ID,
        secretAccessKey: event.secrets.AWS_SECRET_ACCESS_KEY,
      },
      region: event.secrets.AWS_REGION || 'us-east-1',
    });
  
    const command = new SendEmailCommand({
      Destination: {
        ToAddresses: [event.notification.to],
      },
      Message: {
        Body: {
          Html: {
            Charset: 'UTF-8',
            Data: event.notification.text,
          },
        },
        Subject: {
          Charset: 'UTF-8',
          Data: event.notification.subject,
        },
      },
      Source: event.notification.from,
    });
  
    try {
  
      await client.send(command);
      return;
    } catch (error) {
      console.error('Error sending email via AWS SES:', error);
      return error;
    }
  
   
  };