Gmail certificate warning in Postbox caused by Kaspersky Lab’s internet security software How to fix certificate warnings caused by Kaspersky’s security software As a result, your mail client will keep complaining about certificate mismatches and connection sniffing. Now Kaspersky is acting as your mail client towards your mail servers on one hand and as a mail delivery agent towards your mail client (such as Postbox or Thunderbird) on the other hand. (Unfortunately, this will do nothing for the security of the connection offered by your mail server to the Kaspersky intercept.)
To its credit, Kaspersky Lab uses its own SSL certificates in order to protect the “last mile” of your connectivity: the communications taking place between your mail client and their network’s mail scanning servers. Having done that, Kaspersky injects its own mail scanning severs between your mail client (such as Postfix) and the Mail Delivery Agent (such as Dovecot) that’s part of your mail server. Understanding the mail intercept in Kaspersky Internet Security 2018Īfter installation, Kaspersky Internet Security 2018 intercepts the login credentials which your mail client sends across the network to authenticate for the use of mail services. The good news is you don’t need to remove the software nor do you need to deactivate scanning of encrypted connections. This will cause your mail client to complain about invalid certificates from your mail service providers. Kaspersky will intercept your mail connections, inject itself between your mail client and mail server, and use its own certificates to protect the “last mile” of your connectivity. While this behavior is mostly desirable, it may occasionally go too far. Kaspersky Lab’s newest generation of security software, Kaspersky Internet Security 2018, sports a nifty new feature: support for scanning of encrypted connections, including IMAP/SMTP over SSL between your mail client and your mail servers.
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