diff --git a/action.yml b/action.yml
index fe608aee9..e6b1d8860 100644
--- a/action.yml
+++ b/action.yml
@@ -1,4 +1,4 @@
-name: Send email
+name: Send email with OAuth2
 description: Send an email to multiple recipients
 author: cougargrades
 branding:
@@ -59,6 +59,19 @@ inputs:
   priority:
     description: Set Priority level for the mail message to 'high', 'normal' (default) or 'low'
     required: false
+  # https://nodemailer.com/smtp/oauth2/
+  oauth_user:
+    description: User email address (required)
+    required: false
+  oauth_client_id:
+    description: Is the registered client id of the application
+    required: false
+  oauth_client_secret:
+    description: Is the registered client secret of the application
+    required: false
+  oauth_refresh_token:
+    description: Is an optional refresh token. If it is provided then Nodemailer tries to generate a new access token if existing one expires or fails
+    required: false
 runs:
   using: node12
   main: main.js
diff --git a/main.js b/main.js
index 14c932c33..17395246a 100644
--- a/main.js
+++ b/main.js
@@ -56,17 +56,32 @@ async function main() {
         const convertMarkdown = core.getInput("convert_markdown", { required: false })
         const ignoreCert = core.getInput("ignore_cert", { required: false })
         const priority = core.getInput("priority", { required: false })
+        // ---
+        const oauth_user = core.getInput("oauth_user")
+        const oauth_client_id = core.getInput("oauth_client_id")
+        const oauth_client_secret = core.getInput("oauth_client_secret")
+        const oauth_refresh_token = core.getInput("oauth_refresh_token")
 
         if (!username || !password) {
             core.warning("Username and password not specified. You should only do this if you are using a self-hosted runner to access an on-premise mail server.")
         }
 
+        if (!(oauth_user && oauth_client_id && oauth_client_secret && oauth_refresh_token)) {
+            core.warning("Some OAuth2 arguments were missing.")
+        }     
+
         const transport = nodemailer.createTransport({
             host: serverAddress,
             auth: username && password ? {
                 user: username,
                 pass: password
-            } : undefined,
+            } : (oauth_user && oauth_client_id && oauth_client_secret && oauth_refresh_token ? {
+                type: 'OAuth2',
+                user: oauth_user,
+                clientId: oauth_client_id,
+                clientSecret: oauth_client_secret,
+                refreshToken: oauth_refresh_token,
+            } : undefined),
             port: serverPort,
             secure: secure == "true" ? true : serverPort == "465",
             tls: ignoreCert == "true" ? {