system
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I had a feeling the problem may lie with the connection as it is SSL/TLS on Thunderbird, but it’s not set up with authentication of a TLS certificate, it’s using a password.
I did not get any error message when sending e mails about the certificate being invalid and I did not export the certificate in Avast. Perhaps this is the problem? Was working fine in Avast 8 and it was SSL also.
I’m very confused as to what to do here.