ProtonMail is one of the most popular secure email client. Think I'll go and do something else for a while :-)30 Reasons to Create a Free ProtonMail Account There is something else going on here and I am at a loss!!! I 'pasted' the password in - because there is no way to view it (Improve?). I have checked the info on this window and it is all CORRECT. I have tried port 1143, 'Automatic', 'STARTSL' on Outgoing. If I now click 'Advanced config' it will exit (Bug?). The 'Done' button isn't active unless I set to 'Normal Password' but this is what I get when I click it. I noticed before that we did fine the server and this seems to also find it (no more 127.0.0.1). I am attaching a screen shot of where I am up to now. So I was surprised to see that the account had been set up but continued on from there. On the window 'Set Up an Existing Account' it had failed to find the configuration and when I clicked 'Advanced config.' it simply closed the window. I had forgotten that it hadn't properly completed the setup. It is not a failure of Thunderbird.ĭeleted the account and started over. I have my doubts you will be able to add the suggested exception, but that is a matter for you and proton mail if it is the case. I think I can be sure that you will not be able to use TLS or SSL on the connection as there will not be a valid certificate for the 'server' (127.0.0.1) on the local machine. You might also find that your anti virus product blocks communication on the loopback address, that is how some malware communicates with itself so it is considered a 'risk' by some products. I assume it is pretending to be an IMAP server, so I guess you will need to use the to configure the account in Thunderbird. Oh a google search indicates you are probably trying to connect to the proton mail bridge.

So I assume you have some sort of security software that thinks is should be accessing your mail before you do. The server name is set to your local network card loopback address.

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