docs(firestore-send-email): add note about bulk email service provide…

…rs (#172)
firebase · Jan 27, 2020 · d0de3bc · d0de3bc
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Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/firestore-send-email/PREINSTALL.md b/firestore-send-email/PREINSTALL.md
@@ -16,7 +16,7 @@ admin.firestore().collection('mail').add({
 
 You can also optionally configure this extension to render emails using [Handlebar](https://handlebarsjs.com/) templates. Each template is a document stored in a Cloud Firestore collection.
 
-When you configure this extension, you'll need to supply your **SMTP credentials for mail delivery**.
+When you configure this extension, you'll need to supply your **SMTP credentials for mail delivery**. Note that this extension is for use with bulk email service providers, like SendGrid, Mailgun, etc.
 
 #### Additional setup