Here you can find the official instructions from the manufacturers on how to enable extended logs for error diagnostics:

Outlook: https://support.microsoft.com/en-us/topic/how-to-enable-global-and-advanced-logging-for-microsoft-outlook-15c74560-2aaa-befd-c256-7c8823b1aefa

Thunderbird: https://www.thunderbird-mail.de/lexicon/entry/215-protokoll-log-datei-der-server-verbindung-mit-imap-pop-und-smtp-erstellen/