If you still have difficulties after trying TLS changes, or you know your mail servers support TLS 1.2, see: If you need to connect to mail servers with outdated security, or if you want to check if this is the cause of your problem, you can temporarily re-enable the older security protocols in Thunderbird settings using the process below. If your email provider only supports the outdated security protocols TLS 1.0 or TLS 1.1, then downloading (receiving) and sending emails will not work. Thunderbird is serious about protecting the privacy and security of your communications, so by default, Thunderbird 78 will not connect to servers that do not support the modern (over ten years old) TLS 1.2 connection security protocol. One reason why this might happen is your email provider is still using very outdated security protocols. Thunderbird Release Notes (all releases, including details on the latest minor releases)Īfter upgrading to Thunderbird 78, I cannot receive or send email messages.Where can I find more information on changes and new features in Thunderbird 78? 4 Where can I find information on Thunderbird's new encryption technology, OpenPGP?.3 When writing a new message, how can I add, edit, or remove recipients in Thunderbird 78?.
#THUNDERBIRD 2 HOW TO#
2.1 How to enable outdated security protocols TLS 1.0 and 1.1.2 After upgrading to Thunderbird 78, I cannot receive or send email messages.1 Where can I find more information on changes and new features in Thunderbird 78?.
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