diff --git a/app/validators/typoed_email_validator.rb b/app/validators/typoed_email_validator.rb
index f2f8e5d7..717fae97 100644
--- a/app/validators/typoed_email_validator.rb
+++ b/app/validators/typoed_email_validator.rb
@@ -29,6 +29,7 @@ class TypoedEmailValidator < ActiveModel::EachValidator
       iclooud.com
       iclould.com
       icluod.com
+      maibox.org
       protonail.com
       xn--gmail-xk1c.com
       yahooo.com
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index c3071896..784a6aaf 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -138,6 +138,7 @@ RSpec.describe User, type: :model do
     include_examples "invalid email", "fritz.fantom@iclooud.com"
     include_examples "invalid email", "fritz.fantom@iclould.com"
     include_examples "invalid email", "fritz.fantom@icluod.com"
+    include_examples "invalid email", "fritz.fantom@maibox.org"
     include_examples "invalid email", "fritz.fantom@protonail.com"
     include_examples "invalid email", "fritz.fantom@xn--gmail-xk1c.com"
     include_examples "invalid email", "fritz.fantom@yahooo.com"