remove EMAIL_BACKEND from app settings (#43)

* remove EMAIL_BACKEND from app settings

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: joshuadavidthomas

README.md

@@ -9,7 +9,7 @@
 
 `django-email-relay` enables Django projects without direct access to a preferred SMTP server to use that server for email dispatch.
 
-It consists of two parts: 
+It consists of two parts:
 
 1. A Django app with a custom email backend that stores emails in a central database queue. This is what you will use on all the distributed Django projects that you would like to give access to the preferred SMTP server.
 

src/email_relay/conf.py

@@ -12,7 +12,6 @@
 @dataclass
 class AppSettings:
     DATABASE_ALIAS: str = EMAIL_RELAY_DATABASE_ALIAS
-    EMAIL_BACKEND: str = "django.core.mail.backends.smtp.EmailBackend"
     EMAIL_MAX_BATCH: int | None = None
     EMAIL_MAX_DEFERRED: int | None = None
     EMAIL_MAX_RETRIES: int | None = None

src/email_relay/relay.py

@@ -6,6 +6,7 @@
 from itertools import chain
 from socket import error as socket_error
 
+from django.conf import settings
 from django.core.mail import get_connection
 from django.db import transaction
 
@@ -18,8 +19,6 @@
 def send_all():
     logger.info("sending emails")
 
-    connection = get_connection(backend=app_settings.EMAIL_BACKEND)
-
     counts = {
         "sent": 0,
         "deferred": 0,
@@ -40,6 +39,8 @@ def send_all():
         logger.debug(msg)
         message_batch = message_batch[: app_settings.EMAIL_MAX_BATCH]
 
+    connection = None
+
     for message in message_batch:
         with transaction.atomic():
             try:
@@ -52,7 +53,12 @@ def send_all():
                 continue
             try:
                 if connection is None:
-                    connection = get_connection(backend=app_settings.EMAIL_BACKEND)
+                    relay_email_backend = getattr(
+                        settings,
+                        "EMAIL_BACKEND",
+                        "django.core.mail.backends.smtp.EmailBackend",
+                    )
+                    connection = get_connection(backend=relay_email_backend)
                 email = message.email
                 if email is not None:
                     email.connection = connection