Troubleshooting 'Invalid Mail Server Certificate' Warnings

This Article Applies to:

AVG Business Antivirus

Email Shield in AVG Antivirus uses an advanced scanning method for incoming and outgoing emails over SSL/TLS secured connections. Third-party email clients have their own certificate stores and may require extra configuration to avoid warnings about invalid mail server certificates when sending or receiving emails. If you are receiving such warnings, importing the AVG's Email Shield certificate into your email client should help resolve the issue.

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

To export your the Email Shield certificate:

Open the Antivirus client
Go to Menu, then select Settings
Click Search in the top right corner
Type geek:area and hit ENTER

In the Mail Shield section, ensure the checkbox next to Scan SSL connections is ticked, then click Perform next to Export certificate

Select the export location
In the AVG export confirmation dialog, click OK

Once you have exported the certificate, import it to your email client.

The certificate-related options are usually part of an email client's Privacy & Security settings (or Trust Center settings in Outlook in particular). If you are unsure how to import your certificate, please refer to your email client's and provider's documentation for more detailed instructions.

Importing AVG's Email Shield certificate to your email client should stop warnings about an invalid mail server certificate. If you keep encountering the same issue after the import, contact our Business Support team for further assistance.