diff --git a/app/validators/typoed_email_validator.rb b/app/validators/typoed_email_validator.rb
index 5cc07cff..e529e1fb 100644
--- a/app/validators/typoed_email_validator.rb
+++ b/app/validators/typoed_email_validator.rb
@@ -7,6 +7,7 @@ class TypoedEmailValidator < ActiveModel::EachValidator
   INVALID_ENDINGS = [
     # with @:
     *%w[
+      aoo.com
       fmail.com
       gail.com
       gamil.com
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index af65a555..f1f2abdc 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -81,6 +81,7 @@ RSpec.describe User, type: :model do
     # nor .mail (.email is, however)
     include_examples "invalid email", "fritz.fantom@proton.mail"
     # common typos:
+    include_examples "invalid email", "fritz.fantom@aoo.com"
     include_examples "invalid email", "fritz.fantom@fmail.com"
     include_examples "invalid email", "fritz.fantom@gamil.com"
     include_examples "invalid email", "fritz.fantom@gemail.com"