Add mail functionality into the development branch (#12)

* Added basic code for sending emails
+ Added tests for emails
+ Modified README.md to reflect changes to .env file

* [create-pull-request] push formatted files

* Added dkim

* Fixed mistake in docker-compose.yml

Co-authored-by: Stefan <[email protected]>

docker-compose.yml

@@ -1,22 +1,24 @@
 version: "3"
 services:
-        mail:
-                image: boky/postfix
-                restart: always
-                environment:
-                        - ALLOWED_SENDER_DOMAINS=mail.${DOMAIN}
-                ports: 
-                        - "587:587"
-                container_name: "postfix"
-        postgres:
-                image: postgres
-                restart: always
-                environment:
-                        - POSTGRES_PASSWORD=${DATABASE_PASSWORD}
-                ports:
-                        - 5432:5432
-                container_name: "postgres"
-        #server:
-        #        build: .
-        #        restart: always
-        #        container_name: "server"
+  mail:
+    image: boky/postfix
+    restart: always
+    environment:
+      - ALLOWED_SENDER_DOMAINS=mail.${DOMAIN}
+    ports:
+      - "587:587"
+    container_name: "postfix"
+    volumes:
+      - ./host/keys/:/etc/opendkim/keys
+  postgres:
+    image: postgres
+    restart: always
+    environment:
+      - POSTGRES_PASSWORD=${DATABASE_PASSWORD}
+    ports:
+      - 5432:5432
+    container_name: "postgres"
+  #server:
+  #        build: .
+  #        restart: always
+  #        container_name: "server"