[Update] 修改测试邮件后，配置获取不稳定的Bug（显示给settings赋值导致）

apps/settings/api.py

@@ -7,7 +7,7 @@ from smtplib import SMTPSenderRefused
 from rest_framework import generics
 from rest_framework.views import Response, APIView
 from django.conf import settings
-from django.core.mail import send_mail
+from django.core.mail import send_mail, get_connection
 from django.utils.translation import ugettext_lazy as _
 
 from .utils import (
@@ -35,18 +35,33 @@ class MailTestingAPI(APIView):
     def post(self, request):
         serializer = self.serializer_class(data=request.data)
         if serializer.is_valid():
+            email_host = serializer.validated_data['EMAIL_HOST']
+            email_port = serializer.validated_data['EMAIL_PORT']
+            email_host_user = serializer.validated_data["EMAIL_HOST_USER"]
+            email_host_password = serializer.validated_data['EMAIL_HOST_PASSWORD']
             email_from = serializer.validated_data["EMAIL_FROM"]
             email_recipient = serializer.validated_data["EMAIL_RECIPIENT"]
-            email_host_user = serializer.validated_data["EMAIL_HOST_USER"]
-            for k, v in serializer.validated_data.items():
-                if k.startswith('EMAIL'):
-                    setattr(settings, k, v)
+            email_use_ssl = serializer.validated_data['EMAIL_USE_SSL']
+            email_use_tls = serializer.validated_data['EMAIL_USE_TLS']
+
+            # 设置 settings 的值，会导致动态配置在当前进程失效
+            # for k, v in serializer.validated_data.items():
+            #     if k.startswith('EMAIL'):
+            #         setattr(settings, k, v)
             try:
                 subject = "Test"
                 message = "Test smtp setting"
                 email_from = email_from or email_host_user
                 email_recipient = email_recipient or email_from
-                send_mail(subject, message,  email_from, [email_recipient])
+                connection = get_connection(
+                    host=email_host, port=email_port,
+                    uesrname=email_host_user, password=email_host_password,
+                    use_tls=email_use_tls, use_ssl=email_use_ssl,
+                )
+                send_mail(
+                    subject, message,  email_from, [email_recipient],
+                    connection=connection
+                )
             except SMTPSenderRefused as e:
                 resp = e.smtp_error
                 if isinstance(resp, bytes):