diff --git a/src/dhapi/client/mailjet_email_client.py b/src/dhapi/client/mailjet_email_client.py
index 05e4337..6dddf1e 100644
--- a/src/dhapi/client/mailjet_email_client.py
+++ b/src/dhapi/client/mailjet_email_client.py
@@ -6,17 +6,17 @@
 
 
 class MailjetEmailClient:
-    def __init__(self, to_email, api_key, api_secret, _sender_email):
-        self._to_email = to_email
+    def __init__(self, recipient_email, sender_email, api_key, api_secret):
+        self._recipient_email = recipient_email
+        self._sender_email = sender_email
         self._mailjet = Client(auth=(api_key, api_secret), version="v3.1")
-        self._sender_email = _sender_email
 
     def send_email(self, subject, body):
         data = {
             "Messages": [
                 {
                     "From": {"Email": self._sender_email, "Name": "동행복권 API"},
-                    "To": [{"Email": self._to_email, "Name": self._to_email}],
+                    "To": [{"Email": self._recipient_email, "Name": self._recipient_email}],
                     "Subject": subject,
                     "TextPart": body,
                     "HTMLPart": "",
diff --git a/src/dhapi/router/arg_parser.py b/src/dhapi/router/arg_parser.py
index 3ae9c83..7b0e7df 100644
--- a/src/dhapi/router/arg_parser.py
+++ b/src/dhapi/router/arg_parser.py
@@ -3,8 +3,8 @@
 
 from dhapi.configuration.logger import set_logger
 from dhapi.domain_object.lotto645_buy_request import Lotto645BuyRequest
-from dhapi.router.credentials_provider import get_credentials
 from dhapi.meta.version_provider import get_installed_version
+from dhapi.router.credentials_provider import get_credentials
 
 
 class HelpOnErrorParser(argparse.ArgumentParser):
@@ -112,20 +112,16 @@ def user_id(self):
     def user_pw(self):
         return self._args.password
 
-    def email(self):
-        return self._args.email
-
-    def mailjet_api_key(self):
-        return self._args.mailjet_api_key
-
-    def mailjet_api_secret(self):
-        return self._args.mailjet_api_secret
-
-    def mailjet_sender_email(self):
-        return self._args.mailjet_sender_email
+    def email_source(self):
+        return {
+            "recipient_email": self._args.email,
+            "sender_email": self._args.mailjet_sender_email,
+            "api_key": self._args.mailjet_api_key,
+            "api_secret": self._args.mailjet_api_secret,
+        }
 
     def send_result_to_email(self):
-        return self.email() is not None
+        return self._args.email is not None
 
     def is_quiet(self):
         return self._args.quiet
diff --git a/tests/test_arg_parser.py b/tests/test_arg_parser.py
index aaee948..30b71c4 100644
--- a/tests/test_arg_parser.py
+++ b/tests/test_arg_parser.py
@@ -15,10 +15,13 @@ def test_given_email_flag_is_set_and_api_credentials_not_set_when_arg_parser_ini
     @patch.object(sys, 'argv', ["dhapi", "buy_lotto645"])
     def test_given_email_flag_not_set_when_arg_parser_email_method_used_then_no_error(self, get_credentials_mock):
         sut = ArgParser()
-        self.assertIsNone(sut.mailjet_api_key())
-        self.assertIsNone(sut.mailjet_api_secret())
-        self.assertIsNone(sut.mailjet_sender_email())
 
+        self.assertDictEqual(sut.email_source(), {
+            "recipient_email": None,
+            "sender_email": None,
+            "api_key": None,
+            "api_secret": None,
+        })
 
     @patch("dhapi.router.arg_parser.get_credentials", return_value={"mailjet_api_key": "test_key", "mailjet_api_secret": "test_secret", "mailjet_sender_email": "test_email@email.com"})
     @patch.object(sys, 'argv', ["dhapi", "buy_lotto645", "-e", "receiver_email@email.com"])
diff --git a/tests/test_mailjet_email_client.py b/tests/test_mailjet_email_client.py
index c38da4a..3c9f10e 100644
--- a/tests/test_mailjet_email_client.py
+++ b/tests/test_mailjet_email_client.py
@@ -7,6 +7,6 @@ class TestMailjetEmailClient(unittest.TestCase):
 
     @unittest.skip("sending real email is not needed after checking success")
     def test_send_email(self):
-        sut = MailjetEmailClient("EMAIL", "API_KEY", "SECRET_KEY")
+        sut = MailjetEmailClient("TO_EMAIL", "FROM_EMAIL", "API_KEY", "SECRET_KEY")
 
         sut.send_email("hello", "world")