More details and instructions at Thunderbird 78 FAQ. You can temporarily lower the bar to check if this is the reason for your problem (which obviously reduces security, so it is not recommended). If your provider does not support the newer versions of the protocol, sending and receiving of messages may fail. Thunderbird 78 expects higher security standards for the so-called TLS network encryption protocol. The problem suddenly started after updating to Thunderbird version 78. 5 Are you exceeding mail provider access limits?.4 Are you receiving some emails but not others?.3 Did your ability to receive mail suddenly stop? Was it working before?.2 Is your account configured correctly?.1 The problem suddenly started after updating to Thunderbird version 78.
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