← Back to Email not sending

Likely fix

Fix: Gmail app not sending

The Gmail app may not send because of a bad connection, sync problem, stuck outbox, large attachment, account sign-in issue, or app cache problem.

Quick answer

Check internet, open the outbox, remove large attachments, restart the Gmail app, and make sure the account is syncing.

Important warning

If you are on a workplace or school account, admin policies may block some sending or attachment behavior.

Try this

  1. 1 Switch between WiFi and mobile data to test the connection.
  2. 2 Open Gmail and check the Outbox.
  3. 3 Remove large attachments from stuck emails.
  4. 4 Restart the Gmail app.
  5. 5 Restart the phone.
  6. 6 Make sure Gmail sync is enabled for the account.
  7. 7 Update the Gmail app.
  8. 8 Remove and re-add the account if Gmail keeps failing.

Common causes

Bad WiFi or mobile data connection.

Gmail sync is paused or disabled.

Large attachment.

Account needs sign-in again.

Gmail app cache or update problem.

Work or school policy restriction.

What to check next

  • Check whether Gmail sends on mobile data.
  • Check whether the email is in Outbox.
  • Check Gmail sync settings.
  • Check whether the account needs sign-in.
  • Check whether a simple no-attachment email sends.

FAQ

Why is the Gmail app not sending emails?

The Gmail app may be offline, stuck syncing, blocked by a large attachment, or waiting for account sign-in.

Where is the Gmail outbox?

Open the Gmail menu and look for Outbox. Stuck messages usually appear there until they send successfully.

Can switching from WiFi to mobile data help?

Yes. If WiFi is blocking or failing, mobile data can confirm whether the connection is the problem.

Related fixes

Fix: Outlook app not sending on phone

The Outlook mobile app may not send because of connection problems, a stuck outbox, large attachment, account sign-in issue, sync problem, or app bug.

Fix: Email stuck in outbox

An email stuck in the outbox usually means the mail app cannot connect to the sending server, the attachment is too large, the app is offline, or the account needs you to sign in again.

Fix: Outlook not sending emails

Outlook usually fails to send when it is offline, a message is stuck in the outbox, the attachment is too large, the account password changed, or SMTP/account settings are wrong.

Fix: Email won’t send with attachment

Emails with attachments fail when the file is too large, blocked by security rules, still uploading, stored only in the cloud, or using a file type the mail service refuses.

Fix: Gmail not sending in browser

Gmail in a browser can fail to send because of internet problems, a large attachment, browser extensions, cached data, account storage issues, or a temporary Gmail problem.

Fix: Outlook.com not sending in browser

Outlook.com can fail to send because of browser issues, attachments, account limits, storage problems, extensions, or a temporary Microsoft service problem.