This open source email client also comes with a highly-efficient built-in spam filter that uses Bayesian statistical analysis to determine spam from legit emails.Īlthough built-in spam filter takes some time to learn about the incoming emails, it starts working efficiently once the learning process is over. And for the features that are not available by default, the huge collection of third-party add-ons make up for it.Īny reliable email client includes an efficient spam filter, and the Thunderbird is no exception. Thunderbird supports third-party calendar app integration for event and appointment reminders. It also offers offline access to emails a feature missing from the built-in Windows mail app. Thunderbird is the best free email client for Windows allowing the users to manage multiple email accounts with ease.

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