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Troubleshooting email client warnings about invalid server certificates

 

After installing AVG AntiVirus, some third-party email clients, such as Mozilla Thunderbird, SeaMonkey, The Bat!, or Microsoft Outlook, may show that the mail server certificate is invalid when you send and receive emails.

Email Shield in AVG AntiVirus uses an advanced scanning method for incoming and outgoing emails over SSL/TLS secured connections. Mozilla Thunderbird, Sea Monkey, The Bat!, and Microsoft Outlook have their own certificate stores and may require extra configuration to avoid warnings about invalid mail server certificates.

For Mozilla Thunderbird, SeaMonkey, and The Bat!, follow the steps below to stop warnings about invalid mail server certificates by exporting the Email Shield certificate, then importing it into your email client's certificate store.

For Microsoft Outlook, follow the steps in the Troubleshoot Microsoft Outlook errors section to reinstall AVG AntiVirus.

Export Email Shield certificate

  1. Open AVG AntiVirus and go to ☰ Menu ▸ Settings.
  2. Click the Search icon in the top-right corner.
  3. Type geek:area into the text box, and select AVG Geek from the search results.
  4. Scroll to the Email Shield section. Ensure the box next to Scan SSL connections is ticked, then click Perform next to Export certificate.
  5. Select a location to save the exported Email Shield certificate (for example, your Windows Desktop) and click Save.
  6. Click OK in the AVG Information dialog.

The Email Shield certificate is exported. Continue following the steps below to import the Email Shield certificate into your mail client.

Each email account in your mail client needs to be configured as required by your mail provider. Refer to your mail client's and mail provider's documentation for instructions.

Import Email Shield certificate

  1. In Mozilla Thunderbird, click ☰ Menu (the three lines) ▸ Settings.
  2. Select Privacy & Security in the left panel.
  3. Scroll to the Certificates section, then click Manage Certificates...
  4. Select the Authorities tab, then click Import...
  5. Locate the Email Shield certificate you previously exported from AVG AntiVirus, select the file, then click Open.
  6. Tick Trust this CA to identify websites, then click OK.
  7. When the Certificate Manager screen appears again, click the Servers tab.
  8. Ensure that there is no entry for AVG Email Scanner. If an entry exists, delete all certificates connected to AVG Email Scanner in the Servers tab. Then, click OK to save the changes.

The AVG Email Shield certificate is now imported to Mozilla Thunderbird.

  1. In SeaMonkey, click Edit ▸ Preferences....
  2. Click the arrow next to Privacy & Security to expand the section.
  3. Select Certificates, then click Manage Certificates....
  4. Select the Authorities tab, then click Import....
  5. Locate the Email Shield certificate you previously exported from AVG AntiVirus, select the file, then click Open.
  6. Tick Trust this CA to identify websites and click OK.
  7. When the Certificate Manager screen appears again, click the Servers tab.
  8. Ensure that there is no entry for AVG Email Scanner. If an entry exists, delete all certificates connected to AVG Email Scanner in the Servers tab. Then, click OK to close the Certificate Manager.
  9. Click OK in the Preferences window to apply the changes.

The AVG Email Shield certificate is now imported to SeaMonkey.

  1. In The Bat!, click Tools and select Address Book.
  2. Beside Trusted Root CA, click the vertical ellipses (⋮) and select New Contact from the context menu.
  3. Type AVG Email Shield in the Name field and click the green tick sign in the New Certificate panel above.
  4. Ensure that AVG Email Shield is selected and click the green Manage Certificates panel.
  5. Click Import....
  6. Locate the Email Shield certificate you previously exported from AVG AntiVirus, select the file, then click Open.
  7. When the Email Shield certificate appears in the Certificates tab, click OK to apply the changes.

The AVG Email Shield certificate is now imported to The Bat!.

Troubleshoot Microsoft Outlook errors

If you are seeing certificate warnings or errors in Microsoft Outlook, we recommend you reinstall AVG AntiVirus. For detailed instructions, follow the steps below:

  1. Uninstall your AVG Internet Security or AVG AntiVirus Free.
  2. Restart your Windows device.
  3. After your version of AVG AntiVirus is completely removed from your device, reinstall AVG Internet Security or AVG AntiVirus Free.
  4. Restart your Windows device again.

Once AVG AntiVirus is reinstalled, open Microsoft Outlook and check if the issue persists.

  • AVG Internet Security
  • AVG AntiVirus Free
  • Windows
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