Please use google translate With this version I can't set up the FASTWEB mail account. Sorry not to use thunderbird anymore. I'm sure I'm wrong but I don't know what. the Gmail mail account works perfectly. Thanks Thunderbird has changed the minimum protocol security level for TLS and it is possible that the Fastweb server is still using old protocol for imap and pop. You can reset the minimim level. Follow advise at this link and then restart Thunderbird. https://support.mozilla.org/en-US/kb/thunderbird-78-faq#w_after-upgrading-to-thunderbird-78-i-cannot-get-or-send-email-messages Thunderbird ha modificato il livello minimo di sicurezza del protocollo per TLS ed è possibile che il server Fastweb utilizzi ancora il vecchio protocollo per imap e pop. È possibile ripristinare il livello minimo. Segui i consigli a questo link e riavvia Thunderbird. https://support.mozilla.org/it/kb/domande-piu-frequenti-thunderbird-78#w_impossibile-scaricare-la-posta-dopo-laggiornamento-a-thunderbird-78