After installing Avast Antivirus some 3rd party email clients, such as Mozilla Thunderbird, may show that the mail server certificate is invalid when you send and receive emails.
The Mail Shield in Avast Antivirus uses an advanced scanning method for incoming and outgoing emails over SSL/TLS secured connections. Mozilla Thunderbird or other emails clients have their own certificate stores and may require extra configuration to avoid warnings about invalid mail server certificates. Continuer la lecture de « Avast Internet Security – export certificat »