After you install Avast Antivirus, some third-party email clients, such as Mozilla Thunderbird, SeaMonkey, or The Bat!, may show that the mail server certificate is invalid when you send and receive emails.
Mail Shield in Avast Antivirus uses an advanced scanning method for incoming and outgoing emails over SSL/TLS secured connections. Mozilla Thunderbird, Sea Monkey, and The Bat! have their own certificate stores and may require extra configuration to avoid warnings about invalid mail server certificates.
Follow the steps in this article to learn how to stop warnings about invalid mail server certificates by exporting the Mail Shield certificate, then importing it into your email client's certificate store.
Export the Mail Shield certificate
- Open Avast Antivirus and go to
☰Menu ▸ Settings.
- Click Search in the top-right corner.
geek:areainto the search field, then select Avast Geek from the search results.
- Scroll to the Mail Shield section. Ensure the box next to Mail Shield: Scan SSL connections is ticked, then click Perform next to Export certificate.
- Select a location to save the exported Mail Shield certificate (for example, your Windows Desktop) and click Save.
- Click OK in the Avast Information dialog.
- Import the Mail Shield certificate into your mail client.
Import the Mail Shield certificate
- Avast Omni 21.x for Windows
- Avast Premium Security 21.x for Windows
- Avast Free Antivirus 21.x for Windows
- Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1 with Convenient Rollup Update, 32 / 64-bit