最近，我在使用 Emacs (24.4.2) + Gnus (0.12) 设置电子邮件时遇到了问题。似乎 TSL 连接不起作用：
gnutls.c: [0] (Emacs) fatal error: The TLS connection was non-properly terminated.
gnutls.el: (err=[-110] The TLS connection was non-properly terminated.) boot: (:priority NORMAL :hostname smtp.me.com :loglevel 0 :min-prime-bits 256 :trustfiles nil :crlfiles nil :keylist nil :verify-flags nil :verify-error nil :callbacks nil)
smtpmail-send-it: Sending failed: 530 5.7.0 No STARTTLS command has been given.
是 Gnus 还是 Openssl 问题？我应该如何调试和修复它？
这是 smtp 跟踪缓冲区的输出：
220 nk11p00mm-asmtp003.example.com -- Server ESMTP (Oracle Communications Messaging Server 7u4-27.10(7.0.4.27.9) 64bit (built Jun 6 2014))
250-nk11p00mm-asmtp003.example.com
250-8BITMIME
250-PIPELINING
250-CHUNKING
250-DSN
250-ENHANCEDSTATUSCODES
250-EXPN
250-HELP
250-XADR
250-XSTA
250-XCIR
250-XGEN
250-XLOOP 098E7F59418D8F04E0C7135651497A4E
250-STARTTLS
250-NO-SOLICITING
250 SIZE 28311552
220 2.5.0 Go ahead with TLS negotiation.
Process smtpmail deleted
220 nk11p00mm-asmtp003.example.com -- Server ESMTP (Oracle Communications Messaging Server 7u4-27.10(7.0.4.27.9) 64bit (built Jun 6 2014))
MAIL FROM:<john.doe@example.com>
250-nk11p00mm-asmtp003.example.com
250-8BITMIME
250-PIPELINING
250-CHUNKING
250-DSN
250-ENHANCEDSTATUSCODES
250-EXPN
250-HELP
250-XADR
250-XSTA
250-XCIR
250-XGEN
250-XLOOP 098E7F59418D8F04E0C7135651497A4E
250-STARTTLS
250-NO-SOLICITING
250 SIZE 28311552
RCPT TO:<john.doe@example.com>
530 5.7.0 No STARTTLS command has been given.
QUIT
503 5.5.0 No MAIL FROM command has been issued.