diff --git a/seminar/views/views_all.py b/seminar/views/views_all.py
index 22095fb1..a12bbc98 100644
--- a/seminar/views/views_all.py
+++ b/seminar/views/views_all.py
@@ -1233,6 +1233,12 @@ def prihlaskaView(request):
 					err_logger.warn(msg + str(form_hash))
 				r.save()
 
+			send_mail(
+				subject="Registrace na M&M",
+				message=f"Tento e-mail byl právě zaregistrován na mam.matfyz.cz.", # TODO: Dovymyslet text.
+				from_email="registrace@mam.mff.cuni.cz",  # FIXME: Chceme to mít radši tady, nebo v nastavení?
+				recipient_list=list([fcd['email']]),
+			)
 
 			return formularOKView(request)