Update README.md

Add Enable raw message delivery configuration to SNS

README.md

@@ -22,11 +22,11 @@ php bin/console mautic:plugins:reload
 
 ## CONFIGURATION MAUTIC
 
-Be sure to use the `ses+api` as Data Source Name, or DSN.
+Be sure to use the `ses+api` as Data Source Name (DSN).
 The following is the example for the DSN.
 `ses+api://ACCESS_KEY:SECRET_KEY@default?region=REGION`
 
-Follow the steps tp setup Mailjet SMTP DSN:
+Follow the steps to setup Mailjet SMTP DSN:
 
 1. Navigate to Configuration > Mail Send Settings
 2. Update the following fields leaving rest default or empty,
@@ -47,8 +47,12 @@ The `<region>` is AWS region were run AWS SES in your account
 
 Process bounces you need to configure an AWS SNS to send a callback to Mautic.
 
-- Configure a HTTP SNS topic to request to: `URL_MAUTIC`/mailer/callback
-- Confirm SNS, this plugin automatic activate.
+1. Create a SNS topic attached to AWS SES Identity.
+2. Configure a suscription:
+   - Protocol: HTTPS
+   - **Enable raw message delivery** 
+   - Endpoint: `URL_MAUTIC`/mailer/callback.
+4. Confirm SNS suscription, this plugin automatic activate.
 
 ## AUTHOR