diff --git a/app/jobs/scheduled/poll_mailbox.rb b/app/jobs/scheduled/poll_mailbox.rb
index 6f43a6f34a9..608559dff6e 100644
--- a/app/jobs/scheduled/poll_mailbox.rb
+++ b/app/jobs/scheduled/poll_mailbox.rb
@@ -51,6 +51,8 @@ module Jobs
           message_template = :email_reject_topic_closed
         when Email::Receiver::AutoGeneratedEmailError
           message_template = :email_reject_auto_generated
+        when Discourse::InvalidAccess
+          message_template = :email_reject_invalid_access
         when ActiveRecord::Rollback
           message_template = :email_reject_post_error
         when Email::Receiver::InvalidPost
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 30b1c8dd813..ee0ec4e0e5b 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -1632,6 +1632,13 @@ en:
 
         We couldn't find your reply in the provided email. **Make sure your reply is at the top of the email** -- we can't process inline replies.
 
+    email_reject_invalid_access:
+      subject_template: "[%{site_name}] Email issue -- Invalid Access"
+      text_body_template: |
+        We're sorry, but your email message to %{destination} (titled %{former_title}) didn't work.
+
+        Your account does not have the privileges to post new topics in that category. If you believe this is in error, contact a staff member.
+
     email_reject_post_error:
       subject_template: "[%{site_name}] Email issue -- Posting error"
       text_body_template: |
diff --git a/spec/components/email/receiver_spec.rb b/spec/components/email/receiver_spec.rb
index dedb2a86355..ec0d69e0bae 100644
--- a/spec/components/email/receiver_spec.rb
+++ b/spec/components/email/receiver_spec.rb
@@ -562,6 +562,25 @@ greatest show ever created. Everyone should watch it.
       expect(e.message).to include("too short")
     end
 
+
+    it "blocks user in restricted group from creating topic" do
+      to = "some@email.com"
+
+      restricted_user = Fabricate(:user, trust_level: 4)
+      restricted_group = Fabricate(:group)
+      restricted_group.add(restricted_user)
+      restricted_group.save
+
+      category = Fabricate(:category, email_in_allow_strangers: false, email_in: to)
+      category.set_permissions(restricted_group => :readonly)
+      category.save
+
+      expect{
+        process_email(from: restricted_user.email, to: to)
+      }.to raise_error(Discourse::InvalidAccess)
+    end
+
+
   end
 
 
diff --git a/spec/jobs/poll_mailbox_spec.rb b/spec/jobs/poll_mailbox_spec.rb
index 6c1423a8d8f..fc009bfb216 100644
--- a/spec/jobs/poll_mailbox_spec.rb
+++ b/spec/jobs/poll_mailbox_spec.rb
@@ -152,6 +152,23 @@ describe Jobs::PollMailbox do
           end
         end
       end
+
+      describe "user in restricted group" do
+
+        it "raises InvalidAccess error" do
+          restricted_group = Fabricate(:group)
+          restricted_group.add(user)
+          restricted_group.save
+
+          category.set_permissions(restricted_group => :readonly)
+          category.save
+
+          expect_exception Discourse::InvalidAccess
+
+          poller.handle_mail(email)
+          expect(email).to be_deleted
+        end
+      end
     end
 
     describe "a valid reply" do