thunderbird 78.3.1 (64-bit) on windows 10 with proton bridge fails sending mail (ssl self signed error)
The windows version alongside protonmail bridge version 1.3.3 which is latest today 30'th sept 2020 fails to send messages using a proton mailbox . error is Sending of the message failed. The certificate is not trusted because it is self-signed. The configuration related to 127.0.0.1 must be corrected. the configuration was deleted, remade, redone, all per proton instructions and community claims it's a thunderbird bug. the certificate issued by bridge can be seen under Options - Privacy and Security - Certificates - Manage Certificates - Server tab listed as a permanent cert expiring in 2040.
My pc's date and time are correct, i checked so there shouldnt be any time/date issue. I've been using proton and other providers via thunderbird for years, it's my default mail client since 2006. I've had a lot of non-standard mail setups, smime certs, private mail servers with custom ports/auth methods etc. It is not an issue of user error. i tried several times, thought maybe i was just tired initially. It is a bug. or something of the sort. I contacted proton and i decided to post here too. Some reddit threads already a week old exist on this very issue. What is going on and when can a fix be expected ?
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I have found another such question here with a such solution - can you try this: The website may try to fallback to TLS 1.0 in a way that is no longer allowed in current releases or may be using a deprecated cipher suite.
You can open the about:config page via the location/address bar and use its search bar to locate this pref:
security.tls.insecure_fallback_hosts
You can double-click the line to modify the pref and add full domain to this pref. If there are already websites (domains) in this list then add a comma and the new domain (no spaces). You should only see domains separated by a comma in the value column.