email client introduced

configuration/base.yaml

@@ -6,3 +6,8 @@ database:
   username: "postgres"
   password: "password"
   database_name: "newsletter"
+email_client:
+  base_url: "localhost"
+  sender_email: "test@gmail.com"
+  authorization_token: "my-secret-token"
+  timeout_milliseconds: 10000

configuration/production.yaml

@@ -2,3 +2,6 @@ application:
   host: 0.0.0.0
 database:
   require_ssl: true
+email_client:
+  base_url: "https://api.postmarkapp.com"
+  sender_email: "andre@futureblog.eu"