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error message: Sending of the message failed. Peer using unsupported version of security protocol. The configuration related to mail.vfast.co.uk must be corrected.

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How do I correct the problem given by error message above as suddenly won't receive or send emails - it seems to be associated with a thunderbird update

How do I correct the problem given by error message above as suddenly won't receive or send emails - it seems to be associated with a thunderbird update

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