diff --git a/core/admin/mailu/ui/views/domains.py b/core/admin/mailu/ui/views/domains.py
index a48bb154..4010e2ae 100644
--- a/core/admin/mailu/ui/views/domains.py
+++ b/core/admin/mailu/ui/views/domains.py
@@ -2,6 +2,7 @@ from mailu import models
 from mailu.ui import ui, forms, access
 from flask import current_app as app
 
+import validators
 import flask
 import flask_login
 import wtforms_components
@@ -18,18 +19,21 @@ def domain_list():
 def domain_create():
     form = forms.DomainForm()
     if form.validate_on_submit():
-        conflicting_domain = models.Domain.query.get(form.name.data)
-        conflicting_alternative = models.Alternative.query.get(form.name.data)
-        conflicting_relay = models.Relay.query.get(form.name.data)
-        if conflicting_domain or conflicting_alternative or conflicting_relay:
-            flask.flash('Domain %s is already used' % form.name.data, 'error')
+        if validators.domain(form.name.data):
+            conflicting_domain = models.Domain.query.get(form.name.data)
+            conflicting_alternative = models.Alternative.query.get(form.name.data)
+            conflicting_relay = models.Relay.query.get(form.name.data)
+            if conflicting_domain or conflicting_alternative or conflicting_relay:
+                flask.flash('Domain %s is already used' % form.name.data, 'error')
+            else:
+                domain = models.Domain()
+                form.populate_obj(domain)
+                models.db.session.add(domain)
+                models.db.session.commit()
+                flask.flash('Domain %s created' % domain)
+                return flask.redirect(flask.url_for('.domain_list'))
         else:
-            domain = models.Domain()
-            form.populate_obj(domain)
-            models.db.session.add(domain)
-            models.db.session.commit()
-            flask.flash('Domain %s created' % domain)
-            return flask.redirect(flask.url_for('.domain_list'))
+            flask.flash('Domain %s is invalid' % form.name.data, 'error')
     return flask.render_template('domain/create.html', form=form)
 
 
diff --git a/towncrier/newsfragments/2210.bugfix b/towncrier/newsfragments/2210.bugfix
new file mode 100644
index 00000000..32c19003
--- /dev/null
+++ b/towncrier/newsfragments/2210.bugfix
@@ -0,0 +1 @@
+Add input validation for domain creation