I have a problem with adding mail account to Thunderbird. When I try add account and click "Ready" (bold "Gotowe" on the screen.png) then appear window from window.png screen. I can uncheck/check checkbox, click "Download certificate" ("Pobierz certyfikat" on the window.png), click "Confirm security exception" ("Potwierdz wyjątek bezpieczeństwa" on the window.png) and this window from window.png appear again and again. I use Postfix under Ubuntu 16.04 and the newest ISP. Postfix uses : Code: inside /etc/postfix/main.cf: # TLS parameters smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key which are: lrwxrwxrwx 1 root root 48 Mar 13 07:42 smtpd.cert -> /usr/local/ispconfig/interface/ssl/ispserver.crt lrwxrwxrwx 1 root root 48 Mar 13 07:42 smtpd.key -> /usr/local/ispconfig/interface/ssl/ispserver.key Can anybody help with this? PS The files ispserver.crt and ispserver.key are: Code: lrwxrwxrwx 1 root root 48 Nov 3 2017 ispserver.key -> /etc/letsencrypt/live/s1.example.net/privkey.pem lrwxrwxrwx 1 root root 50 Nov 3 2017 ispserver.crt -> /etc/letsencrypt/live/s1.example.net/fullchain.pem which are : Code: lrwxrwxrwx 1 root root 43 Jul 12 05:00 fullchain.pem -> ../../archive/s1.example.net/fullchain3.pem lrwxrwxrwx 1 root root 41 Jul 12 05:00 privkey.pem -> ../../archive/s1.example.net/privkey3.pem
