原标题：IMAP 连接 Dovecot 仅从 Thunderbird 失败
我在端口 993 上设置了带有 SSL (TLS) 的 Dovecot。我可以连接 Outlook、PHP SMTP 和 Android Mail，但是 Thunderbird 无法连接。它说Configuration could not be verified - is the username or password wrong?。Dovecot 错误日志显示：
Jan 05 22:41:45 imap-login: Warning: SSL: where=0x10, ret=1: before/accept initialization [1.2.3.4]
Jan 05 22:41:45 imap-login: Warning: SSL: where=0x2001, ret=1: before/accept initialization [1.2.3.4]
Jan 05 22:41:45 imap-login: Warning: SSL alert: where=0x4008, ret=598: fatal unknown [1.2.3.4]
Jan 05 22:41:45 imap-login: Warning: SSL: where=0x2002, ret=-1: SSLv3 read client …