README, mail_template.py and LASTLOG environment variable.

README.MD

@@ -67,7 +67,16 @@ Todo
 
 
 ### mail_template.py  
-File containing email template as well as 
+File containing email template as well as subject and list of email recievers.  
+```
+recivers = ["example@example.com", "example2@example.com"]
+subject = f"Backup on \"{HOSTNAME}\", for SERVICE complete."
+```   
+Recivers is a python list of email addresses, a seperate email will be sent to each reciever.  
+Subject is the subjectline of the email being sent (surprise!).  
+
+It is made to be called by ```make_backup.sh``` and expects the LASTLOG environment variable to be set.  
+LASTLOG points to a a logfile containing only the result of the latest backup done. 
 
 
 ### secrets.env