Auto-Sync Is Off: Why No Email Arrives on Android

The banner "Auto-sync is off. Tap to turn on" means Android is not syncing your accounts in the background, so Gmail only updates when you open it and refresh by hand. Tapping the banner is the quickest fix. If it does nothing, or the banner comes back, two switches decide whether mail arrives on its own: Android's global Auto-sync data switch, and Gmail's own Sync Gmail setting for your account.

Gmail's wording varies by version. You may see "Auto-sync is off", "Inbox sync is off" or "Primary sync is off", and all of them point at the same two places. The steps below take a couple of minutes, and the same logic applies when sync is turned off in other email apps.

How to turn on auto sync in Gmail on Android#

Work through these in order. Most people are done by step three.

1. 1

   Tap the banner

   Tap "Auto-sync is off. Tap to turn on" at the top of the Gmail inbox. Depending on the Gmail and Android version, it either switches sync on or takes you to the sync setting. Pull down to refresh and see whether new mail appears. If the banner stays or returns, carry on.

2. 2

   Turn on the global Auto-sync data switch

   Open Android Settings and find the accounts section. On a Samsung phone, Samsung's support steps are Settings > Accounts and backup > Manage accounts, then turn on Auto sync data. On Pixel and other phones the section is usually called Accounts, Users and accounts, or Passwords, passkeys and accounts, and the master switch is labelled something like Auto-sync data or Automatically sync app data. Labels differ by brand and version, so if you cannot find it, search Settings for the word sync.

3. 3

   Make sure Gmail is on for your Google account

   In the same accounts area, tap Google, then your account, then Account sync, and check that Gmail is switched on. Google's Pixel help page also gives a route through Settings > About phone > Google Account > Account sync, where More > Sync now forces a manual sync. On Samsung, tap your Google account and then Sync account.

4. 4

   Tick Sync Gmail inside the Gmail app

   Open Gmail, tap the menu (three lines), then Settings, then your account. Under Data usage, make sure Sync Gmail is ticked. On some versions the option sits directly under the account name. This is separate from the Android switch, and either one being off can stop new mail from arriving.

5. 5

   Check the battery side, then test

   If sync is on but mail still arrives late, a battery limit is the usual cause. Turn off Battery Saver while you test, and set Gmail's battery option to unrestricted (the wording varies by phone). Then send yourself a message from another account and see how long it takes to show up. If it arrives within a minute or two with the screen on, sync is working, and any remaining delay is a battery or idle setting rather than a sync switch.

Where is auto-sync in Android settings, by phone?#

The setting exists on Android phones generally, but menu names change with the brand and the version. Treat this table as a guide and use Settings search for the word sync if your phone differs.

What is auto-sync in Gmail, and what does "Auto-sync is off" mean?#

Auto-sync is Android's permission for an account to refresh its data in the background without you opening the app. Google says its own apps sync with your Google Account automatically by default, and that you can turn account sync on or off per app. When sync is off, apps wait until you open them.

So the banner is a warning, not an error: Gmail is telling you that background updates are paused on this phone. Your mail is still on Google's servers, and it shows up when you refresh or turn sync back on.

Should auto-sync be on or off in Gmail?#

Leave it on unless you are deliberately saving data or battery. With it on, new mail can arrive without you opening the app. With it off, Gmail and other apps that use account sync (calendar, contacts and so on) only update when you open them and refresh by hand.

Google's help for reducing mobile data suggests turning off auto-sync to use less data, with the cost that you then sync manually. That is a fair trade on a tight data plan, and a poor one if you wait on time-sensitive mail such as login codes or customer replies.

A middle path is to keep auto-sync on and restrict the individual apps you do not need in the background, rather than switching the whole phone to manual.

Auto-sync is on, but mail still does not arrive#

If both switches are on and Gmail is still late or silent, go through these one-line causes. Battery limits are the most common: set Gmail to unrestricted in its battery settings, and see battery optimisation stopping background sync for the manufacturer-specific versions.

Doze is the other one. Android's own power management can defer syncs while the phone sits idle and run them in short maintenance windows, so delays of minutes are normal on a still phone. Why Android delays email in Doze mode explains it. If Gmail is still not syncing after everything above, the full diagnosis is in Gmail still not syncing after turning auto-sync on.

• Background data restricted for the app: check the app's mobile data setting and allow background data.
• Low phone storage: Google says Gmail does not sync when the device is low on storage, so free some space.
• Battery Saver on: it limits background activity for apps, so turn it off while you test.
• Sync Gmail ticked off inside the app: it is separate from Android's switch, so check both.
• Wrong or expired sign-in: if Gmail asks you to sign in again, do that before anything else.

Sync turned off in another email app?#

The same two-layer idea applies to other apps. Android's account sync covers apps that register an account, and most mail apps also have their own sync setting or sync schedule inside the app. If Outlook or Samsung Email stops updating, check Android's account sync first, then the app's own account settings, then battery limits.

App-specific walkthroughs: Outlook app not syncing on Android and Samsung Email not syncing.

A different route: the web app on Android#

If you would rather not depend on your phone's sync settings for your inbox, AI Emaily is an AI-native email client that runs on Android today as an installable web app. A native Android app is not out yet. Your mailboxes sync on our servers, so the phone's Auto-sync data switch does not decide whether your mail is fetched from Gmail.

The phone still has to show it to you. The app updates while you have it open, and its docs list background push for the installed web app when you allow notifications, but Android battery limits on the browser can still delay alerts, and it needs a connection to read or send mail. You can start a 7-day free trial on Pro or Autopilot; see AI Emaily pricing.