diff --git a/src/handlers.spec.js b/src/handlers.spec.js
index 09486c1..8fffd87 100644
--- a/src/handlers.spec.js
+++ b/src/handlers.spec.js
@@ -5,7 +5,7 @@ import { payload } from './mail';
 
 describe('handlers', () => {
   beforeAll(() => {
-    global.fetch = vi.fn().mockImplementation(() => new Response());
+    global.fetch = vi.fn().mockImplementation(() => new Response('{}'));
   });
 
   it('400 if missing required parameters', async () => {
diff --git a/src/log.js b/src/log.js
new file mode 100644
index 0000000..d9187cf
--- /dev/null
+++ b/src/log.js
@@ -0,0 +1,20 @@
+export const log = async ({ env, user_id, tags }) => {
+  const response = await fetch('https://api.logsnag.com/v1/log', {
+    headers: {
+      'Content-Type': 'application/json',
+      Authorization: `Bearer ${env.LOGSNAG_API_TOKEN}`,
+    },
+    body: JSON.stringify({
+      project: 'cinotify',
+      channel: 'api',
+      event: 'mail',
+      icon: '📬',
+      user_id,
+      tags,
+    }),
+    method: 'POST',
+  });
+  const data = await response.json();
+  // eslint-disable-next-line no-console
+  console.log(data);
+};
diff --git a/src/mail.js b/src/mail.js
index c11db55..eead642 100644
--- a/src/mail.js
+++ b/src/mail.js
@@ -1,3 +1,5 @@
+import { log } from './log';
+
 export const payload = ({ subject, to, type, body, attachments }) => ({
   // https://docs.sendgrid.com/api-reference/mail-send/mail-send#body
   attachments,
@@ -31,6 +33,15 @@ export const mail = async ({ env = {}, ...rest }) => {
     method: 'POST',
     body: JSON.stringify(payload({ ...rest })),
   });
+  await log({
+    env,
+    user_id: rest.to?.split(',')[0],
+    tags: {
+      attachments: !!rest.attachments,
+      contentType: rest.type,
+      status: response.status,
+    },
+  });
   if (response.status > 299) {
     throw new Error((await response.json()).errors[0].message);
   }
diff --git a/src/mail.test.js b/src/mail.test.js
index 4247d16..f4d3c69 100644
--- a/src/mail.test.js
+++ b/src/mail.test.js
@@ -31,7 +31,7 @@ describe('mail', () => {
     global.fetch = vi.fn();
   });
   it('makes a request to the sendgrid api', async () => {
-    global.fetch.mockResolvedValueOnce({ json: () => '{}' });
+    global.fetch.mockResolvedValue({ json: () => '{}' });
     await mail(input);
     expect(global.fetch).toHaveBeenCalledWith(
       'https://api.sendgrid.com/v3/mail/send',
@@ -45,6 +45,27 @@ describe('mail', () => {
       },
     );
   });
+  it('logs', async () => {
+    global.fetch.mockResolvedValue({ json: () => '{}', status: 200 });
+    await mail({ ...input, to: 'one@example.com,two@example.com' });
+    expect(global.fetch).toHaveBeenCalledWith(
+      'https://api.logsnag.com/v1/log',
+      expect.objectContaining({
+        body: JSON.stringify({
+          project: 'cinotify',
+          channel: 'api',
+          event: 'mail',
+          icon: '📬',
+          user_id: 'one@example.com',
+          tags: {
+            attachments: true,
+            contentType: 'text/html',
+            status: 200,
+          },
+        }),
+      }),
+    );
+  });
 });
 
 describe('payload', () => {