smtp_ssl sslerror:[ssl:unknown_protocol]未知协议(_SSL.C:590)

Question

此问题与SMTPLIB的SMTP_SSL连接有关。

与SMTP连接(无SSL(时，它正在工作。

尝试相同的主机＆amp;smtp_ssl中的端口，引起了错误。该错误仅基于主机，Gmail设置也可以正常工作。

请检查以下示例，让我知道Outlook是否需要任何更改＆amp;Office365。

In [1]: import smtplib
In [10]: smtplib.SMTP_SSL('smtp.gmail.com', 465, timeout=100)
Out[10]: <smtplib.SMTP_SSL instance at 0x109ccaf38>
In [2]: smtplib.SMTP('smtp-mail.outlook.com', 587, timeout=100)
Out[1]: <smtplib.SMTP instance at 0x10a00bb90>
In [3]: smtplib.SMTP_SSL('smtp-mail.outlook.com', 587, timeout=100)
---------------------------------------------------------------------------
SSLError                                  Traceback (most recent call last)
<ipython-input-9-f0c5b0de4e24> in <module>()
----> 1 smtplib.SMTP_SSL('smtp-mail.outlook.com', 587, timeout=100)
/python2.7/smtplib.pyc in __init__(self, host, port, local_hostname, keyfile, certfile, timeout)
    794             self.keyfile = keyfile
    795             self.certfile = certfile
--> 796             SMTP.__init__(self, host, port, local_hostname, timeout)
    797 
    798         def _get_socket(self, host, port, timeout):
python2.7/smtplib.pyc in __init__(self, host, port, local_hostname, timeout)
    254         self.esmtp_features = {}
    255         if host:
--> 256             (code, msg) = self.connect(host, port)
    257             if code != 220:
    258                 raise SMTPConnectError(code, msg)
python2.7/smtplib.pyc in connect(self, host, port)
    314         if self.debuglevel > 0:
    315             print>>stderr, 'connect:', (host, port)
--> 316         self.sock = self._get_socket(host, port, self.timeout)
    317         (code, msg) = self.getreply()
    318         if self.debuglevel > 0:
python2.7/smtplib.pyc in _get_socket(self, host, port, timeout)
    800                 print>>stderr, 'connect:', (host, port)
    801             new_socket = socket.create_connection((host, port), timeout)
--> 802             new_socket = ssl.wrap_socket(new_socket, self.keyfile, self.certfile)
    803             self.file = SSLFakeFile(new_socket)
    804             return new_socket
python2.7/ssl.pyc in wrap_socket(sock, keyfile, certfile, server_side, cert_reqs, ssl_version, ca_certs, do_handshake_on_connect, suppress_ragged_eofs, ciphers)
    909                      do_handshake_on_connect=do_handshake_on_connect,
    910                      suppress_ragged_eofs=suppress_ragged_eofs,
--> 911                      ciphers=ciphers)
    912 
    913 # some utility functions
python2.7/ssl.pyc in __init__(self, sock, keyfile, certfile, server_side, cert_reqs, ssl_version, ca_certs, do_handshake_on_connect, family, type, proto, fileno, suppress_ragged_eofs, npn_protocols, ciphers, server_hostname, _context)
    577                         # non-blocking
    578                         raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
--> 579                     self.do_handshake()
    580 
    581             except (OSError, ValueError):
python2.7/ssl.pyc in do_handshake(self, block)
    806             if timeout == 0.0 and block:
    807                 self.settimeout(None)
--> 808             self._sslobj.do_handshake()
    809         finally:
    810             self.settimeout(timeout)
SSLError: [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:590)

ref url：https：//docs.python.org/2/library/smtplib.html#smtplib.smtp_sssl

Answer 1

我今天遇到了同样的问题，我已经解决了。

这是我的演示。

def _send_email(self, msg):
    if self.smtp_port == 465:
        server = smtplib.SMTP_SSL(self.smtp_host, self.smtp_port)
    elif self.smtp_port == 587:
        server = smtplib.SMTP(self.smtp_host, self.smtp_port)
        server.starttls()
    else:
        raise Exception('port {} not support'.format(SMTP_PORT))
    server.set_debuglevel(1)
    server.login(self.from_addr, self.password)
    server.sendmail(self.from_addr, [self.to_addr], msg.as_string())
    server.quit()

在我看来，(也许是错误的，只是个人理解。

465和587用于不同的协议。前者使用SSL和后者使用tls。他们都使用SSL在SMTP通信之前对我们的电子邮件内容进行加密。

但对于587。您必须先发送STARTTLS。如果您不这样做，您将收到这样的消息，例如Must issue a STARTTLS command first.，对于465，您无法使用TLS命令