[Email Security] Update system alerts & email alerts in migration guide

Author: Maddy-Cloudflare

src/content/docs/email-security/migrate-to-email-security.mdx

@@ -43,7 +43,9 @@ In Zero Trust Email Security, webhooks are instead referred to as logs. You can
 
 ## Set up system alerts
 
-In Area 1, you can view [statistics](/email-security/reporting/statistics-overview/) of your account in the Home section.
+In Area 1 you can:
+
+- View [statistics](/email-security/reporting/statistics-overview/) of your account in the Home section.
 
 In Email Security, you can:
 
@@ -53,6 +55,10 @@ In Email Security, you can:
 
 ## Email alerts
 
+:::note
+Starting from October 2025, email alerts will no longer be available.
+:::
+
 In Area 1, you receive daily or weekly updates of the number of emails dispositioned.
 
 In Email Security, you can view [email monitoring](/cloudflare-one/email-security/email-monitoring/) over the last 90, 30, 7, 3, 1 day(s).