邮件失败; [SSL:UNKNOWN_PROTOCOL]未知协议(_ssl.c:645)

Question

这是一个关于通过经过身份验证的SMTP(而非gmail)发送电子邮件的问题.下面的脚本通过本网站上的各种问题和答案汇总在一起,但是我得到的错误是没有"googlable"候选人用于这个特定的工具组合.我在Python 3.5.1中工作,它产生了这个错误:

邮件失败; [SSL:UNKNOWN_PROTOCOL]未知协议(_ssl.c:645)

这是客户端错误还是服务器？我错过了一些我不知道的证书吗？AFAIK服务器支持SSL身份验证.任何想法和推动正确的方向将不胜感激.

import sys
from smtplib import SMTP_SSL as SMTP
from email.mime.text import MIMEText

# credentials masked, obviously
SMTPserver = 'myserver'
sender = 'mymail'
destination = ['recipient']

USERNAME = "myusername"
PASSWORD = "mypass"

# typical values for text_subtype are plain, html, xml
text_subtype = 'plain'

content = """\
Test message
"""

subject = "Sent from Python"

try:
    msg = MIMEText(content, text_subtype)
    msg['Subject'] = subject
    msg['From'] = sender
    conn = SMTP(host=SMTPserver, port=465)
    conn.set_debuglevel(False)
    conn.login(USERNAME, PASSWORD)

    try:
        conn.sendmail(sender, destination, msg.as_string())
    finally:
        conn.quit()

except Exception as exc:
    sys.exit("mail failed; %s" % str(exc))

Answer 1

感谢我的问题下的两位评论员.通过设置导航SSL后

from smtplib import SMTP as SMTP 

创建STMP对象后启用TLS(如果我没有使用正确的术语,请原谅我)

conn = SMTP(host=SMTPserver, port=587)  # object created
conn.ehlo() 
conn.starttls()  # enable TLS
conn.ehlo()

我能够发送电子邮件.

Answer 2

我有同样的问题.我刚改变自:

EMAIL_USE_SSL = True

至:

EMAIL_USE_TLS = True