Fix Gmail Error 707: Message Not Sent (2025)

Updated: 11/29/2025

You click Send in Gmail, wait a few seconds, and then see a popup saying that your message could not be sent, sometimes with the code Error 707 or a similar send failure note. The email sits in your Drafts or Outbox, and trying again gives you the same result while incoming mail still works fine. This usually means there is a local problem with your browser, app, or connection, not that Gmail servers are completely down [web:64][web:66][web:67][web:82].

Method 1: Fix Browser Based Gmail Sending Issues

Temporarily disable ad blockers, script blockers, or old toolbars, then reload Gmail and test sending, if the error disappears, re enable extensions one by one until you find the culprit. If the problem persists, install or open a different browser such as Chrome, Edge, or Firefox, sign into Gmail there, and see if Error 707 still occurs, a clean browser profile is often enough to clear the issue [web:66][web:67][web:82].

Method 2: Check App Updates, Storage, And Connectivity

On Android, open Settings, go to Apps, choose Gmail, and tap Storage, then use Clear cache to remove temporary files, avoiding Clear data unless you are ready to sign in again. Check your device storage to ensure there is enough free space, deleting large videos, photos, or unused apps if needed so Gmail has room to sync and send messages [web:67][web:82].

Method 3: Review Security Tools And Outgoing Settings

Open the Outbox or Drafts folder, delete any old or repeated messages that show sending errors, then compose a brand new email with a short subject and body text and send it to yourself. This clears broken drafts and lets you confirm that the basic send pipeline works again before you retry longer or attachment heavy emails [web:70][web:79][web:82].