diff --git a/mo/web/templates/org_index.html b/mo/web/templates/org_index.html
index d14d84b70f4359936e83bca38535b1deafc223a8..a0229652513f632aa677ca9d566202e01a89bc65 100644
--- a/mo/web/templates/org_index.html
+++ b/mo/web/templates/org_index.html
@@ -3,6 +3,8 @@
 {% block title %}Přístup pro organizátory{% endblock %}
 {% block body %}
 
+{% include "parts/check_dsn.html" %}
+
 {% if overview %}
 
 <h3>Moje soutěže</h3>
diff --git a/mo/web/templates/parts/check_dsn.html b/mo/web/templates/parts/check_dsn.html
new file mode 100644
index 0000000000000000000000000000000000000000..d32bb5d24ba8b1dbc65a35854b11748414b66be5
--- /dev/null
+++ b/mo/web/templates/parts/check_dsn.html
@@ -0,0 +1,13 @@
+{% if g.user.dsn %}
+
+<div class="alert alert-danger">
+	<p>E-mailová adresa spojená s tímto účtem není funkční – pošta se vrací jako nedoručitelná.</p>
+
+	<p>
+		<a class='btn btn-xs btn-primary' href='{{ url_for('user_validate_email') }}'>Ověřit e-mail</a>
+		<a class='btn btn-xs btn-primary' href='{{ url_for('user_settings_personal') }}'>Změnit e-mail</a>
+		<a class='btn btn-xs btn-default' href='{{ url_for('user_dsn') }}'>Detaily problémů</a>
+	</p>
+</div>
+
+{% endif %}
diff --git a/mo/web/templates/settings.html b/mo/web/templates/settings.html
index 50335f12b36d2aaae770f8dedb7ac131278de930..14350ca398072c29d16743f6f53f1232a0347510 100644
--- a/mo/web/templates/settings.html
+++ b/mo/web/templates/settings.html
@@ -3,6 +3,8 @@
 {% block title %}Uživatel {{ user.full_name() }}{% endblock %}
 {% block body %}
 
+{% include "parts/check_dsn.html" %}
+
 	<h3>Osobní údaje</h3>
 
 	<table class=table>
diff --git a/mo/web/templates/user_index.html b/mo/web/templates/user_index.html
index ad3bf1375e9b092f1a31baacbaff7adb5a4456db..46d89241a41efe3881d7271960a0f6d0e7cd3109 100644
--- a/mo/web/templates/user_index.html
+++ b/mo/web/templates/user_index.html
@@ -2,6 +2,8 @@
 {% block title %}Vítejte{% endblock %}
 {% block body %}
 
+{% include "parts/check_dsn.html" %}
+
 {% if pions %}
 	<p>Účastníte se následujících kol MO:
 
diff --git a/mo/web/templates/user_join_list.html b/mo/web/templates/user_join_list.html
index d6af6b7349d54d82f436fc3ba7394966da6e3e06..c45c8e621f1040b0c9b7032680c84f3234f73ed3 100644
--- a/mo/web/templates/user_join_list.html
+++ b/mo/web/templates/user_join_list.html
@@ -2,6 +2,8 @@
 {% block title %}Přihláška do MO{% endblock %}
 {% block body %}
 
+{% include "parts/check_dsn.html" %}
+
 {% if available_rounds %}
 	<p>Zde si můžete vybrat, do kterých kategorií olympiády se přihlásíte.