diff --git a/input/forms.py b/input/forms.py
index b348afd..6c2d8c7 100644
--- a/input/forms.py
+++ b/input/forms.py
@@ -13,7 +13,7 @@ class ProjectForm(ModelForm):
 
     class Meta:
         model = Project
-        exclude = ('pid', 'granted', 'username', 'realname', 'email', 'project_end_mail')
+        exclude = ('pid', 'granted', 'username', 'realname', 'email', 'project_end_mail', 'survey_mail_send')
         widgets = {'start': AdminDateWidget(),
                    'end': AdminDateWidget(),}
 
@@ -28,7 +28,7 @@ class VolunteerForm(ModelForm):
 
     class Meta:
         model = Volunteer
-        exclude = ('granted',)
+        exclude = ('granted','survey_mail_send')
 
 INTERN_CHOICES = [('PRO', 'Projektsteckbrief'),
                   ('HON', 'Ehrenamtsbescheinigung'),
@@ -41,21 +41,21 @@ class InternForm(ModelForm):
 
     class Meta:
         model = Volunteer
-        exclude = ('granted',)
+        exclude = ('granted','survey_mail_send')
 
 
 class LibraryForm(ModelForm):
 
     class Meta:
         model = Library
-        exclude = ('realname', 'email', 'username', 'type', 'granted')
+        exclude = ('realname', 'email', 'username', 'type', 'granted', 'survey_mail_send')
 
 class IFGForm(ModelForm):
     class Meta:
         model = IFG
-        exclude = ('realname', 'email', 'username', 'granted')
+        exclude = ('realname', 'email', 'username', 'granted', 'survey_mail_send')
 
 class HonoraryCertificateForm(ModelForm):
     class Meta:
         model = HonoraryCertificate
-        exclude = ('realname', 'email', 'username', 'granted')
+        exclude = ('realname', 'email', 'username', 'granted', 'survey_mail_send')
diff --git a/input/management/commands/sendmails.py b/input/management/commands/sendmails.py
index c822ae5..49ced69 100644
--- a/input/management/commands/sendmails.py
+++ b/input/management/commands/sendmails.py
@@ -64,7 +64,7 @@ class Command(BaseCommand):
                 project.end_mail_send = True
                 project.save()
             except BadHeaderError:
-                return HttpResponse('Invalid header found.')
+                self.stdout.write(self.style.ERROR('Invalid header found.'))
 
         self.stdout.write(self.style.SUCCESS('end_of_projects_reached() executed.'))
 
@@ -73,15 +73,16 @@ class Command(BaseCommand):
 
         self.end_of_projects_reached()
 
-        supported = Library.objects.filter(granted=True)
+        supported = Library.objects.filter(granted=True)\
+                                   .exclude(survey_mail_send=True)
         print(supported)
         for item in supported:
             self.survey_link(email=item.email,
-                             type=item.type,
-                             pid=9999, ## TODO
-                             name=item.library,
-                             realname=item.realname)
-#            project.end_mail_send = True
-#            project.save()
+                         type=item.type,
+                         pid=9999, ## TODO
+                         name=item.library,
+                         realname=item.realname)
+            item.survey_mail_send = True
+            item.save()
 
         self.stdout.write(self.style.SUCCESS('sendmails custom command executed'))
diff --git a/input/migrations/0022_auto_20201022_1233.py b/input/migrations/0022_auto_20201022_1233.py
new file mode 100644
index 0000000..3ec91cf
--- /dev/null
+++ b/input/migrations/0022_auto_20201022_1233.py
@@ -0,0 +1,33 @@
+# Generated by Django 3.1.1 on 2020-10-22 12:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('input', '0021_auto_20201022_0934'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='honorarycertificate',
+            name='survey_mail_send',
+            field=models.BooleanField(null=True),
+        ),
+        migrations.AddField(
+            model_name='ifg',
+            name='survey_mail_send',
+            field=models.BooleanField(null=True),
+        ),
+        migrations.AddField(
+            model_name='library',
+            name='survey_mail_send',
+            field=models.BooleanField(null=True),
+        ),
+        migrations.AddField(
+            model_name='project',
+            name='survey_mail_send',
+            field=models.BooleanField(null=True),
+        ),
+    ]
diff --git a/input/models.py b/input/models.py
index fb169b6..7f9a9ec 100644
--- a/input/models.py
+++ b/input/models.py
@@ -8,6 +8,7 @@ class Volunteer(models.Model):
     email = models.CharField(max_length=200, null=True)
     username = models.CharField(max_length=200, null=True)
     granted = models.BooleanField(null=True)
+    survey_mail_send = models.BooleanField(null=True)
 
     @classmethod
     def set_granted(cl, key, b):