From 0b41895bbbf83b205cfe3340a16b105086f7e8a5 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Sat, 26 Feb 2022 17:26:28 +0100
Subject: [PATCH] Fix error when a MX is shared across blocked domains (#17650)

---
 app/controllers/admin/email_domain_blocks_controller.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/app/controllers/admin/email_domain_blocks_controller.rb b/app/controllers/admin/email_domain_blocks_controller.rb
index 33ee079f36..a4bbbba5ba 100644
--- a/app/controllers/admin/email_domain_blocks_controller.rb
+++ b/app/controllers/admin/email_domain_blocks_controller.rb
@@ -38,6 +38,8 @@ module Admin
           log_action :create, @email_domain_block
 
           (@email_domain_block.other_domains || []).uniq.each do |domain|
+            next if EmailDomainBlock.where(domain: domain).exists?
+
             other_email_domain_block = EmailDomainBlock.create!(domain: domain, parent: @email_domain_block)
             log_action :create, other_email_domain_block
           end