A long, long time ago, muddled configuration success, a long, long time after configuration or not, then Baidu to CSDN to see each text, and then still unsuccessful, tips are as follows:
Proxy Error

The proxy server could not handle The request POST /redmine/admin/test_email.
Reason: Error reading from remote server
 
The premise of the story begins like this: Once upon a time there was a lazy and stupid person, have to have a brag system to display their own diligence and wisdom, then, a key to found the Windows install Redmine – 3.4.6-1 to show (installation package download address: https://bitnami.com/stack/redmine/installer), and then, and then to the mailbox, configuration, Find the information and then find the file configuration. Yml (my path D:\redmine-3.4.6-1\apps\ Redmine \htdocs\config). Since I am self-aware (flying is also immobile), I first backup the file which has been configured in the configuration and which has not been successfully configured. Then change the file to the following to succeed:
Default :
# Outgoing emails configuration
# See the examples below and the Rails guide for more configuration options:
# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS: True,

# false address: “smtp.exmail.qq.com”
port: 465
domain: “exmail.qq.com”
authentication: : login
enable_starttls_auto: True,
user_name: “[email protected]”
Password: “JBGSNMM”
 
What didn’t work was this (after the page was configured) :
# default configuration options for all environments
default:
# See the examples below and the Rails guide for more configuration options:
# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS: false
address: Smtp.exmail.qq.com
port: 465
domain: example.net
authentication: :login
enable_starttls_auto: True
# default configuration options for all environments
default:
# Outgoing emails configuration
# See the examples below and the Rails guide for more configuration Options:

# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS:
false
address: smtp.exmail.qq.com port: 465
domain: example.net
authentication: : login
enable_starttls_auto: true
user_name: “[email protected]”
Password: “JBGSNMM”
         
Note: 1. The yML file has been configured on the page before changes are made. After the configuration, the second paragraph is still published in the email, and then the first paragraph is fine.
2, other people also have this error, wrong place is different, but very valuable ha. Refer to the link http://oyqiaojin.blog.163.com/blog/static/594525652011411334509/
Also recommended a very valuable words at https://blog.csdn.net/liumiaocn/article/details/74089940?utm_source=blogxgwz8