Update and then..Sending of the message failed! Peer using unsupported version of security protocol.
just updated mozilla email and got this message : Sending of the message failed. Peer using unsupported version of security protocol. The configuration related to smtp.EMAILPROVIDER.com must be corrected
just updated mozilla email and got this message : Sending of the message failed. Peer using unsupported version of security protocol. The configuration related to smtp.EMAILPROVIDER.com must be corrected
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This may be because the server only supports TLS 1.0 or 1.1, whereas TB 78 requires a minimum of TLS 1.2. This is reflected in the preference security.tls.version.min default setting of 3 in Options/General/Config. editor. Right-click the pref., Modify, and change it to 2 and see if it helps, or 1.
http://kb.mozillazine.org/Security.tls.version.*
It could also be due to an antivirus program interfering if it's scanning secure connections.