do not encapsulate emails

src/common/email.py

@@ -46,7 +46,7 @@ def registration(user):
     subject = "KSZKépzés regisztráció"
     message = read_email('registration.txt')
     message = str.format(message % {'name': get_full_name(user)})
-    send_out_mail(subject, message, SENDER_EMAIL, [user['email'], ])
+    send_out_mail(subject, message, SENDER_EMAIL, user['email'])
 
 
 @shared_task()
@@ -54,7 +54,7 @@ def admitted(user):
     subject = "Jelentkezés eredménye"
     message = read_email('admitted.txt')
     message = str.format(message % {'name': get_full_name(user)})
-    send_out_mail(subject, message, SENDER_EMAIL, [user['email'], ])
+    send_out_mail(subject, message, SENDER_EMAIL, user['email'])
 
 
 @shared_task()
@@ -62,7 +62,7 @@ def denied(user):
     subject = "Jelentkezés eredménye"
     message = read_email('denied.txt')
     message = str.format(message % {'name': get_full_name(user)})
-    send_out_mail(subject, message, SENDER_EMAIL, [user['email'], ])
+    send_out_mail(subject, message, SENDER_EMAIL, user['email'])
 
 
 @shared_task()
@@ -75,7 +75,7 @@ def new_homework(user, deadline):
             'name': get_full_name(user),
             'link': HOMEWORK_LINK,
             'deadline': deadline})
-    send_out_mail(subject, message, SENDER_EMAIL, [user['email'], ])
+    send_out_mail(subject, message, SENDER_EMAIL, user['email'])
 
 
 @shared_task()
@@ -90,4 +90,4 @@ def homework_corrected(user, title, accepted):
                                     'link': HOMEWORK_LINK,
                                     'status': status,
                                     'title': title})
-    send_out_mail(subject, message, SENDER_EMAIL, [user['email'], ])
+    send_out_mail(subject, message, SENDER_EMAIL, user['email'])