STEP 1:

CREATE A DATABASE with a name "dss_emailservicedb"

STEP 1.5:

CREATE A DB USER that can use the database.

STEP 2: 
IMPORT DATABASE FILE "dss_DB" to the database created.

STEP 3:
OPEN FILE app/Http/Controllers/MailController.php

STEP 4: 
Change the line'CHANGEME@YOURDOMAIN.ch'to your SENDER EMAIL.

STEP 5:
OPEN .env file in the root folder of the project

STEP 6: 
CHANGE the DB_USERNAME and DB_PASSWORD with the recently created DB USER.

STEP 7:
CHECK if the Website can be visited on the domain you have deployed the application.