diff --git a/src/mailer.js b/src/mailer.js
index c96deb4f..f36c2027 100644
--- a/src/mailer.js
+++ b/src/mailer.js
@@ -86,6 +86,11 @@ const templates = {
             </p>
         `,
     },
+    cardsWarning: {
+        subject: 'Cards queue is getting long',
+        text: 'There\'s {{count}} cards in the queue!',
+        html: '<p>There\'s {{count}} cards in the queue!</p>',
+    }
 }
 
 const applyTemplate = (template, context, params) => {
diff --git a/src/stats.js b/src/stats.js
index 6313667a..8c2a7328 100644
--- a/src/stats.js
+++ b/src/stats.js
@@ -1,4 +1,5 @@
 const {decodeTime} = require('ulid');
+const mailer = require('./mailer');
 
 // TODO all the duplication...
 const buildDict = (fn, ...args) => {
@@ -113,5 +114,9 @@ module.exports.calculateStats = async (db, allLocales) => {
 
     const cardsQueue = (await db.get(`SELECT count(*) as c FROM profiles WHERE card = '' OR cardDark = ''`)).c;
 
+    if (cardsQueue > 64) {
+        mailer('andrea@avris.it', 'cardsWarning', {count: cardsQueue});
+    }
+
     return { calculatedAt: parseInt(new Date() / 1000), users, locales, cardsQueue };
 }