Clarify mail values

- Fixed typo in MAIL_FROM (had no period between suggested subdomain and the start of the domain)
- Changed MAIL_FROM to MAIL_FROM_ADDRESS, since Pterodactyl Panel checks for either of those two env vars, and this makes the difference between it and MAIL_FROM_NAME more clear
- Changed MAIL_FROM_NAME to use the APP_NAME variable

Author: Loki-101

docker-compose.yml

@@ -28,8 +28,8 @@ x-common:
     PTERODACTYL_CLIENT_ALLOCATIONS_RANGE_END: "${AUTO_ALLOCATION_END_PORT}"
   mail:
     &mail-environment
-    MAIL_FROM: "no-reply${DOMAIN}"
-    MAIL_FROM_NAME: "no-reply${DOMAIN}"
+    MAIL_FROM_ADDRESS: "no-reply.${DOMAIN}"
+    MAIL_FROM_NAME: "${APP_NAME}"
     MAIL_DRIVER: "${MAIL_DRIVER}"
     MAIL_HOST: "${SMTP_SERVER}"
     MAIL_PORT: "${SMTP_PORT}"