How to Resolve “Gmail Not Sending Emails” Issue?
Gmail not sending emails is usually caused by browser cache issues, server outages, attachment size limits over 25MB, poor internet connection, or an invalid recipient address. Clear your browser cache, check Google’s status page, and verify the recipient email. If the issue persists, sign out and back in or try a different browser.
You hit Send and nothing happens. Or the email sits in your Outbox indefinitely. Or you get a delivery failure notice without a clear explanation. Gmail not sending emails is one of the most frustrating problems precisely because there are so many possible causes. This guide covers all eight common causes and their direct fixes, starting with the fastest ones to check.
Why Gmail Stops Sending Emails
Eight things commonly cause Gmail to stop sending emails:
First, corrupted browser cache data can disrupt how Gmail communicates with Google’s servers. Second, Gmail’s own SMTP server or the recipient’s mail server may be experiencing temporary downtime. Third, slow or unstable internet connectivity prevents message delivery. Fourth, Gmail may flag your outgoing message as spam or a phishing attempt and block it. Fifth, the email attachment exceeds the 25MB size limit Gmail enforces on all outgoing messages. Sixth, the recipient email address is invalid or mistyped. Seventh, your browser has a compatibility issue with Gmail’s current interface. Eighth, Google may have temporarily blocked your account for sending too frequently or violating policy.
Work through the fixes below in order, starting with the fastest options first.
Fix 1: Clear Your Browser Cache
Cached data that builds up over time is one of the most common causes of Gmail sending failures. Clearing it takes under 2 minutes and often resolves the issue immediately.
Google Chrome: Click the three vertical dots in the top right corner and choose Settings. Navigate to Privacy and Security, then Third-party cookies. Click “See all site data and permissions,” find google.com, locate Gmail, and click the Delete icon. Confirm by clicking Clear.
Firefox: Click the three horizontal lines in the top right and choose Settings. Select Privacy and Settings on the left, then click on “Cookies and site data” and press “Clear data.” Confirm with Clear.
After clearing the cache, reload Gmail and try sending again.
Fix 2: Try a Different Browser
Browser compatibility issues can prevent Gmail from sending emails, especially if you’re running an older browser version. If you normally use Chrome, try Firefox or Microsoft Edge. If the email sends successfully in a different browser, the issue is with your primary browser, not Gmail itself. Either update or reinstall the browser that was failing.
Fix 3: Check Gmail Server Status
Gmail’s servers experience outages periodically. When Gmail’s SMTP server is down, emails queue in your Outbox but can’t be delivered. Navigate to the Google Workspace Status Dashboard in your browser and find Gmail in the list of services. Green means the service is operating normally. Red or orange indicates an active incident that Google is working to resolve. If Gmail’s server is the issue, you just need to wait for Google to fix it.
Fix 4: Sign Out and Sign Back In
Authentication token errors can cause Gmail to malfunction without displaying any clear error message. Signing out and back in resets your session.
- Open Gmail in your browser and click your profile picture in the top right corner.
- Choose Sign Out. If you have multiple Gmail accounts, choose “Sign out of all accounts.”
- Return to the Gmail login page and sign in again with your email address and password.
- Try sending the email again.
Fix 5: Test Your Internet Connection
A weak or unstable connection causes packet loss that prevents Gmail from completing email delivery. Run a speed test at a free site like Fast.com or TestMy.net. If your speed is significantly lower than your plan’s advertised rate, restart your router: unplug it, wait 30 seconds, and plug it back in. Run another speed test after it reconnects. If speed remains poor, contact your internet provider. For mobile devices, switch from Wi-Fi to mobile data and try sending again to isolate whether the issue is specific to your network.
Fix 6: Check Attachment Size
Gmail enforces a strict 25MB limit on all outgoing email attachments. This is a hard limit that applies even when you’re attaching multiple smaller files whose combined size exceeds 25MB. If your email attachment is too large, Gmail will fail to send it without always providing a clear error message. Compress your files with a tool like 7-Zip before attaching, or upload the file to Google Drive and share a link instead of attaching it directly.
Fix 7: Verify the Recipient Address
Gmail accepts any correctly formatted email address at the moment of entry, even if that address doesn’t exist. If you get a “message couldn’t be delivered” bounce, double-check the recipient’s email address character by character. Common mistakes include swapping dots, missing the @ symbol, or mistyping the domain name. Call or message the recipient through another channel to confirm the correct email address if you’re unsure.
Fix 8: Check If Gmail Blocked Your Account
Google temporarily restricts accounts that send emails in volumes that exceed typical usage or that include content violating Gmail’s policies. If your account has been restricted, you’ll typically see a notification in Gmail explaining the restriction and its duration. Most temporary sending limits lift within 24 hours. If you believe your account was restricted in error, contact Gmail support through the Google Account Help Center.
Back Up Your Gmail Emails
Fixing the sending issue is the immediate priority, but it’s worth taking a longer view. Gmail outages, account suspensions, and accidental deletions can put years of important email data at risk. The Turgs Gmail Backup Tool creates a local backup of your Gmail account in over 20 file formats including PST, PDF, EML, and MBOX. It runs on both Windows and Mac, supports date-range filtering, and can back up multiple Gmail accounts. Also read: How to Add Gmail to Outlook if you need desktop access to your Gmail messages.
Running a quarterly Gmail backup means that no sending issue, server outage, or account problem can permanently cost you your email history.
Limitations to Know
Limitations
- Clearing your browser cache signs you out of most websites and may remove saved form data. This is expected behavior, not an error.
- If Gmail’s SMTP server is down, none of the above fixes will help. You can only wait for Google to resolve the outage.
- Gmail’s 25MB attachment limit applies even when files are attached from Google Drive in some situations. Check the actual file size before attributing delivery failure to the server.
- Account restrictions placed by Google for policy violations may take longer than 24 hours to lift. Contact Gmail support directly if the restriction persists.
- Emails that appear to send successfully may still end up in the recipient’s spam folder. Ask the recipient to check their spam if they report not receiving your message.
- Some corporate email servers block incoming Gmail messages by default. If you’re emailing a business address that never receives your emails, the issue may be on the recipient’s end, not yours.
Frequently Asked Questions
Why aren’t my Gmail emails sending?
The most common causes are browser cache corruption, a temporary Gmail server outage, an attachment over 25MB, a poor internet connection, or an invalid recipient email address. Clear your browser cache first, check the Google Workspace Status Dashboard for server issues, and verify the recipient’s address. Those three checks resolve most Gmail sending failures.
How do I check if the Gmail server is down?
Visit the Google Workspace Status Dashboard in your browser at workspace.google.com/status. Find Gmail in the list. A green indicator means the service is operating normally. A red or orange indicator means there’s an active incident. If Gmail is down on Google’s end, wait for them to resolve it before troubleshooting further on your end.
Could my browser cause Gmail to stop sending emails?
Yes. Outdated browsers or browsers with corrupted cache data can prevent Gmail from completing email sends. Clear your browser cache and cookies first. If the issue persists, try a different browser. If Gmail works in a different browser, update or reinstall your primary browser.
Does signing out and back into Gmail actually fix sending issues?
Often, yes. Session token issues can cause Gmail features to fail silently without clear error messages. Signing out and back in resets the authentication session and resolves this type of issue quickly. It takes under a minute to try.
What is Gmail’s maximum attachment size?
Gmail’s outgoing attachment limit is 25MB total per email. This covers all attachments combined, not each file individually. If your total attachment size exceeds 25MB, Gmail won’t send the email. Compress large files, split them across multiple emails, or share via Google Drive link instead.
Can Gmail block my account from sending emails?
Yes. Google can temporarily restrict your account if you send emails at unusually high volume, if your emails contain content that triggers spam filters, or if your sending behavior violates Gmail’s policies. Most sending limits lift within 24 hours. Check for a notification in your Gmail interface or contact Gmail support through the Google Account Help Center if the restriction persists.
