I'm suddenly unable to send emails. Error message reads "peer using unsupported version of security protocol" " The configuration related to mail @activ8.net.au must be corrected". This happened immediately after what appeared to be an update of Thunderbird. I have been into settings to try and rectify the problem without success.
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Same here. There seems to be a global problem after some change or update. So far no solution yet.
Thanks for the response Thomas. Hopefully the problem can be resolved without further delay or i will have to migrate to another server.
If you are using ESET/NOD32 security/AV then probability is very high it is causing your problems. According to their forums, you should temporarily disable SSL until they solve the problem per https://support.eset.com/en/kb3126-disable-ssl-filtering-in-eset-windows-products?ref=esf - the problem is being reported by dozens of users https://forum.eset.com/topic/26517-problems-with-thunderbird-and-imaps/ https://forum.eset.com/discover/
The 'unsupported protocol' error is caused by a conflict between the TLS on the mail server and the version required by TB: