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Thunderbird version 78.0.1 does not send mail with smtp server

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Thunderbird version 78.0.1 does not send mail with smtp server, the checkbox for the use of outgoing credentials such as incoming ones is missing in the configuration window, the smtp server does not connect, the thunderbird error signal says: Sending the message failed. The message could not be sent because the connection to the out.postassl.it outgoing mail server (SMTP) has timed out. Try again. I did several tests with different PCs, different accounts and different mail clients, the problem is with thunderbird version 78.0.1

Thunderbird version 78.0.1 does not send mail with smtp server, the checkbox for the use of outgoing credentials such as incoming ones is missing in the configuration window, the smtp server does not connect, the thunderbird error signal says: Sending the message failed. The message could not be sent because the connection to the out.postassl.it outgoing mail server (SMTP) has timed out. Try again. I did several tests with different PCs, different accounts and different mail clients, the problem is with thunderbird version 78.0.1