参考文章：https://github.com/CDOT-EDX/ProductionStackDocs/wiki/Enable-SMTP-for-EDX-(Production-Stack)

具体到生产或开发环境做的事情：
1.修改文件：
    lms/envs/content.py         Line15        EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
    cms/envs/devstack.py        Line26        EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
    lms/envs/devstack.py         Line30        EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
    cms/envs/common.py         Line360        EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
    lms/envs/common.py         Line730        EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
   将以上 'django.core.mail.backends.console.EmailBackend'改成 'django.core.mail.backends.smtp.EmailBackend'

(以下以163邮箱为例，如果是其他邮箱，注意开启邮箱的SMTP和POP服务，并查下SMTP端口是多少，163 smtp 非ssh端口为25)
2.修改环境变量
  a. cms.env.json
    "DEFAULT_FROM_EMAIL": "xxxxx@163.com",
    "EMAIL_BACKEND": "django.core.mail.backends.smtp.EmailBackend",
    "EMAIL_HOST": "smtp.163.com",
    "EMAIL_PORT": 25,
    "EMAIL_USE_TLS": True,

b. cms.auth.json
    "EMAIL_HOST_PASSWORD": "邮箱的真实密码",
        "EMAIL_HOST_USER": "xxxxx@163.com",

c. lms.env.json
    "DEFAULT_FROM_EMAIL": "xxxxx@163.com",
    "EMAIL_BACKEND": "django.core.mail.backends.smtp.EmailBackend",
    "EMAIL_HOST": "smtp.163.com",
    "EMAIL_PORT": 25,
    "EMAIL_USE_TLS": true,

d. lms.auth.json
    "EMAIL_HOST_PASSWORD": "邮箱的真实密码",
        "EMAIL_HOST_USER": "xxxxx@163.com",

3.修改配置文件
  /devstack/edx-platform/cms/envs/common.py
    EMAIL_HOST = 'smtp.163.com'
    EMAIL_PORT = 25
    EMAIL_USE_TLS = True
    EMAIL_HOST_USER = 'xxxxx@163.com'
    EMAIL_HOST_PASSWORD = '邮箱的真实密码'
    DEFAULT_FROM_EMAIL = 'xxxxx@163.com'
    DEFAULT_FEEDBACK_EMAIL = 'xxxxx@163.com'
    SERVER_EMAIL = 'xxxxx@163.com'

/devstack/edx-platform/lms/envs/aws.py
    EMAIL_HOST = ENV_TOKENS.get('EMAIL_HOST', 'smtp.163.com')  # django default is localhost
    EMAIL_PORT = ENV_TOKENS.get('EMAIL_PORT', 25)  # django default is 25
    EMAIL_USE_TLS = ENV_TOKENS.get('EMAIL_USE_TLS', True)  # django default is False
    ...
    EMAIL_HOST_USER = AUTH_TOKENS.get('EMAIL_HOST_USER', 'xxxxx@163.com')  # django default is ''
    EMAIL_HOST_PASSWORD = AUTH_TOKENS.get('EMAIL_HOST_PASSWORD', '邮箱的真实密码')  # django default is ''