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If you are facing issues with ProtonMail not sending emails, there are several troubleshooting steps you can follow to fix the problem. ProtonMail’s service is generally reliable, but like any online platform, users may encounter occasional issues. Below are common reasons why ProtonMail may not send emails, along with step-by-step instructions to fix the problem.

1. Check Your Internet Connection

One of the simplest reasons for ProtonMail not sending emails is a poor or disconnected internet connection. Ensure that your device is connected to a stable internet connection (either Wi-Fi or cellular data) before attempting to send an email again.

Steps to check:

  • Ensure your device is connected to the internet.
  • If you're on Wi-Fi, try moving closer to the router or restarting your router.
  • If you're on mobile data, try switching to Wi-Fi, as mobile networks can sometimes be unstable.

2. Verify the Recipient’s Email Address

If you are entering the recipient’s email address incorrectly or if there’s a typo, ProtonMail may fail to send the email. It's crucial to ensure that the email address is spelled correctly and in the right format (e.g., user@example.com).

Steps to check:

  • Double-check the recipient’s email address to ensure there are no typos.
  • If possible, confirm with the recipient that their email address is still valid and operational.

3. Check Your ProtonMail Account Storage

If your ProtonMail account is out of storage, you won’t be able to send new emails. ProtonMail has limited storage, especially for free users, so you need to monitor how much space is available in your inbox.

Steps to check:

  • Log into your ProtonMail account.
  • Go to "Settings" and navigate to the “Storage” section to check how much space you have left.
  • If you’re running low on storage, consider deleting unnecessary emails or upgrading to a paid ProtonMail plan for additional storage.

4. Ensure You Are Not Sending Spam

ProtonMail has strict spam filters to prevent misuse of their service. If your email contains content that looks like spam, the system might block it from being sent. Check the content of your email for any language or attachments that could be considered spam.

Steps to check:

  • Avoid sending unsolicited bulk emails, especially if you're using ProtonMail for marketing purposes.
  • Check if your email contains large attachments or links that might trigger spam filters.

5. Clear Your Browser Cache and Cookies

Sometimes, browser issues can interfere with ProtonMail's functionality, including the ability to send emails. Clearing your browser's cache and cookies can help resolve any temporary problems related to the web version of ProtonMail.

Steps to clear cache and cookies:

  • Go to your browser’s settings and find the "Clear browsing data" option.
  • Select to clear cached images and files and cookies from the past hour or day.
  • Restart your browser and log back into ProtonMail to see if you can send emails now.

6. Disable Browser Extensions

Certain browser extensions, particularly ad blockers or privacy-focused add-ons, can interfere with ProtonMail's functionality. If you have extensions enabled, try disabling them to see if they are causing the issue.

Steps to disable extensions:

  • Open your browser settings and go to the extensions section.
  • Disable all extensions temporarily and check if ProtonMail works properly.
  • If the email starts sending again, re-enable the extensions one by one to identify the culprit.

7. Check ProtonMail’s Service Status

ProtonMail occasionally experiences service outages or disruptions that might affect its ability to send emails. If there is a server issue, it will usually be resolved by ProtonMail's technical team in a short period. You can check ProtonMail’s official status page or social media for any updates.

Steps to check:

  • Visit ProtonMail's social media accounts (such as Twitter) to check for any service outage announcements.
  • If you're unable to access ProtonMail’s status page, try searching online for any recent reports of ProtonMail outages.

8. Update Your ProtonMail App or Browser

An outdated ProtonMail app or browser can cause compatibility issues that prevent emails from being sent. Ensure that you are using the latest version of the ProtonMail app or an updated web browser.

Steps to update:

  • Web version: Ensure that your browser is up to date. If you’re using an outdated version of Chrome, Firefox, or Safari, update your browser to the latest version.
  • ProtonMail app: If you are using the ProtonMail mobile app, check for any available updates in the App Store (for iOS) or Google Play Store (for Android).

9. Check for Attachment Issues

If your email contains large attachments, ProtonMail may fail to send it if the attachment size exceeds the platform's limits. ProtonMail allows attachments up to 25 MB for free users and higher limits for paid plans.

Steps to check:

  • Make sure the attachment size is within the limits.
  • If your email exceeds the size limit, try reducing the attachment size by compressing files or using ProtonMail's encrypted file storage service.

10. Use the Correct SMTP Settings

If you're using an email client (like Outlook or Thunderbird) to send ProtonMail emails, ensure that you have configured the SMTP (Simple Mail Transfer Protocol) settings correctly. Incorrect SMTP settings can result in failed email delivery.

Steps to check:

  • Ensure that you are using ProtonMail’s correct SMTP settings (usually, ProtonMail will handle this for you if you’re using their web app).
  • If you are using an email client, double-check that the SMTP server settings are correct (for example, smtp.protonmail.com, port 587, and authentication using your ProtonMail account).

11. Revoke Any Blocked IP Address or IP Block Issues

ProtonMail might block certain IP addresses if suspicious activities, such as spam or brute force attacks, are detected. If you suspect your IP address has been blocked, you can try changing your IP address by restarting your router or contacting ProtonMail support for further assistance.

Steps to check:

  • Restart your router to get a new IP address, especially if you're using dynamic IP addressing.
  • If you're using a VPN, try disabling it temporarily to see if that resolves the issue.

12. Contact ProtonMail Support

If none of the above steps resolve the issue and ProtonMail still isn't sending emails, it’s time to contact ProtonMail's customer support for assistance. Make sure to provide a detailed description of your issue when submitting a support ticket or emailing ProtonMail. This will help them diagnose and fix the problem more quickly.

Steps to contact support:

  • Log into your ProtonMail account.
  • Submit a support ticket through the ProtonMail support page.
  • Alternatively, email support@protonmail.com if you need direct assistance.

Conclusion

If ProtonMail isn’t sending emails, there could be a variety of issues ranging from network problems to account limitations. By following the troubleshooting steps outlined above, you can usually resolve the problem on your own. Start by checking basic things like your internet connection and recipient’s email address, then move on to more technical fixes like clearing cache or reviewing ProtonMail’s storage settings.