Add sender header and env variable

Add sender to the Sender header and MAIL_SENDER environment variable.

Refs EKIR-205

.env

@@ -10,6 +10,7 @@ DEFAULT_RECEIVER=${DEFAULT_RECEIVER}
 # A copy of the emails is always sent to this address
 ALWAYS_RECIPIENT=${ALWAYS_RECIPIENT}
 MAIL_SENDER=${MAIL_SENDER}
+MAIL_FROM=${MAIL_FROM}
 BACKUP_FILE="feedback.backup"
 
 # Location of the csv file that contains emails and municipality names.

app.py

@@ -157,7 +157,8 @@ def send_email(subject, body, recipients, reply_to):
 
     message.set_content(body)
     message["To"] = ",".join(recipients)
-    message["From"] = app.config["MAIL_SENDER"]
+    message["From"] = app.config["MAIL_FROM"]
+    message["Sender"] = app.config["MAIL_SENDER"]
     message["Subject"] = subject
 
     context = ssl.SSLContext(ssl.PROTOCOL_TLS)