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After updating Mozilla Thunderbird to version 78

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  • 5 have this problem
  • 148 views
  • Last reply by terrawai

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After updating Mozilla Thunderbird to version 78, the connection to the mail server was lost, IMAP error the selected authentication method is not suitable, how and what exactly should be fixed on the server if everything works on the previous version

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On TB v78 the minimum requirement for SSL has increased and probably your email service provider still use deprecated security for the mail server. Can you try to set lowest security by following below steps and let us know how it works?

From the menu at the top right, go to Options. Scroll all the way to the bottom and click on Config Editor -> Skip past the warning. Scroll down until you find security.tls.version.min (or paste security.tls.version.min to upper frame) Change the value 3 to 2. Restart TB. If it's still not working then change again same option but this time to 1. Restart TB.

This a better workaround instead of no security (that None) and you should contact your email service provider to update their protection to ssl 1.2...

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Who is your email provider? Open Account Settings. Check which Authentication method is currently in use and report back, or post a screenshot.

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Mail server on iredmail, ssl certificate purchased, everything works everywhere except for the new version of Mozilla Thunderbird, the authentication method is the usual password, the server settings were not changed, I install the old version of Mozilla Thunderbird everything works

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You marked this as solved, so what exactly was the solution?

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accidentally press

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The point is that I can't even see what exactly is wrong, because the authentication method works in other places, I don't understand what mozilla doesn't like

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You are certainly not alone. I have the exact problem as you do and there are other users reporting same issues as well on the forum. Was running 68.12.0 fine but after updating to 78.2.2 three days ago, Thunderbird would no longer download new emails. Status bar showed it is online, when clicked on Get Messages, the status bar displayed "Connected to" my email server but somehow the connect was reset and not proceeding to say "Host contacted, sending login information" or "Checking inbox for new messages".

Was using POP3 account server setting before but tried IMAP as well but still would not work.

Now I've installed an older version Thunderbird 68.9.0 (32-bit version as I'm running Win10 32-bit OS) from the Thunderbird releases download page. Needed to create a new profile as my original profile cannot be re-used in an older version after running 78.2.2. At least I'm able to download new emails from my ISP email server again with 68.9.0.

I can get by downloading emails for now but hopefully, someone can provide a solution or further 78.x updates will fix the problem.

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I found a fix to Thunderbird not connecting to download email by going to account settings and changing the security settings from STARTTLS to none. I think other settings may work as well. I am a novice user who has used Tbird for years and any update has worked fine until 78.2.2 There is something that changed the connection security settings.

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Chosen Solution

On TB v78 the minimum requirement for SSL has increased and probably your email service provider still use deprecated security for the mail server. Can you try to set lowest security by following below steps and let us know how it works?

From the menu at the top right, go to Options. Scroll all the way to the bottom and click on Config Editor -> Skip past the warning. Scroll down until you find security.tls.version.min (or paste security.tls.version.min to upper frame) Change the value 3 to 2. Restart TB. If it's still not working then change again same option but this time to 1. Restart TB.

This a better workaround instead of no security (that None) and you should contact your email service provider to update their protection to ssl 1.2...

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Thank you for your explanation svlad2009! I've changed the security.tls.version.min to 1 in Config Editor and it worked (my email server did not accept 2 either).

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That solution worked for me too. In my case TB did not provided me with an error. Even after deleting the passwords for my IMAP account TB did was not asking for password. (imap.otenet.gr security.tls.version.min to 1) Great solution Thank you.

Modified by manoliar

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I have this problem also so, have gone back to older version that actually worked. My security settings are already at the 1 level so above option not a go. Turned off firewall temporarily and still not receiving emails. Contacted my provider and they remotely tried to fix the settings but still not working. Would love to update it but it caused so many issues last time, I'm not keen. Have been using TB for years and no problems till now.

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