diff --git a/app/services/bulk_upload/lettings/year2022/row_parser.rb b/app/services/bulk_upload/lettings/year2022/row_parser.rb
index 7081353d8..5a9ef579c 100644
--- a/app/services/bulk_upload/lettings/year2022/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2022/row_parser.rb
@@ -511,7 +511,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.find_by(email: field_112)
+    @created_by ||= User.where("lower(email) = ?", field_112&.downcase).first
   end
 
   def duplicate_check_fields
diff --git a/app/services/bulk_upload/lettings/year2023/row_parser.rb b/app/services/bulk_upload/lettings/year2023/row_parser.rb
index 875d7ac30..0ba078efc 100644
--- a/app/services/bulk_upload/lettings/year2023/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/row_parser.rb
@@ -540,7 +540,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.find_by(email: field_3)
+    @created_by ||= User.where("lower(email) = ?", field_3&.downcase).first
   end
 
   def validate_uprn_exists_if_any_key_address_fields_are_blank
diff --git a/app/services/bulk_upload/sales/year2022/row_parser.rb b/app/services/bulk_upload/sales/year2022/row_parser.rb
index a1663fafc..55f5f0ed1 100644
--- a/app/services/bulk_upload/sales/year2022/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2022/row_parser.rb
@@ -934,7 +934,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.find_by(email: field_93)
+    @created_by ||= User.where("lower(email) = ?", field_93&.downcase).first
   end
 
   def hhregres
diff --git a/app/services/bulk_upload/sales/year2023/row_parser.rb b/app/services/bulk_upload/sales/year2023/row_parser.rb
index 17303346f..6ce207abf 100644
--- a/app/services/bulk_upload/sales/year2023/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2023/row_parser.rb
@@ -1112,7 +1112,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.find_by(email: field_2)
+    @created_by ||= User.where("lower(email) = ?", field_2&.downcase).first
   end
 
   def previous_la_known
diff --git a/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
index 5b3262d0b..3d77ff467 100644
--- a/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
@@ -1128,6 +1128,16 @@ RSpec.describe BulkUpload::Lettings::Year2022::RowParser do
         end
       end
 
+      context "when email matches other than casing" do
+        let(:other_user) { create(:user, organisation: owning_org) }
+
+        let(:attributes) { { bulk_upload:, field_111: owning_org.old_visible_id, field_112: other_user.email.upcase!, field_113: managing_org.old_visible_id } }
+
+        it "is permitted" do
+          expect(parser.errors[:field_112]).to be_blank
+        end
+      end
+
       context "when an user part of managing org" do
         let(:other_user) { create(:user, organisation: managing_org) }
 
diff --git a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
index 58aa79a26..399001dbc 100644
--- a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
@@ -753,6 +753,16 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
         end
       end
 
+      context "when email matches other than casing" do
+        let(:other_user) { create(:user, organisation: owning_org) }
+
+        let(:attributes) { { bulk_upload:, field_1: owning_org.old_visible_id, field_3: other_user.email.upcase!, field_2: managing_org.old_visible_id } }
+
+        it "is permitted" do
+          expect(parser.errors[:field_3]).to be_blank
+        end
+      end
+
       context "when an user part of managing org" do
         let(:other_user) { create(:user, organisation: managing_org) }
 
diff --git a/spec/services/bulk_upload/sales/year2022/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2022/row_parser_spec.rb
index 3b18333df..c305c67ed 100644
--- a/spec/services/bulk_upload/sales/year2022/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2022/row_parser_spec.rb
@@ -510,6 +510,16 @@ RSpec.describe BulkUpload::Sales::Year2022::RowParser do
           expect(parser.errors[:field_93]).to be_blank
         end
       end
+
+      context "when email matches other than casing" do
+        let(:other_user) { create(:user, organisation: owning_org) }
+
+        let(:attributes) { { bulk_upload:, field_92: owning_org.old_visible_id, field_93: other_user.email.upcase! } }
+
+        it "is permitted" do
+          expect(parser.errors[:field_93]).to be_blank
+        end
+      end
     end
 
     [
diff --git a/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
index e1137ea84..2e38e4f2c 100644
--- a/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
@@ -459,6 +459,16 @@ RSpec.describe BulkUpload::Sales::Year2023::RowParser do
           expect(parser.errors[:field_2]).to be_blank
         end
       end
+
+      context "when email matches other than casing" do
+        let(:other_user) { create(:user, organisation: owning_org) }
+
+        let(:attributes) { { bulk_upload:, field_1: owning_org.old_visible_id, field_2: other_user.email.upcase! } }
+
+        it "is permitted" do
+          expect(parser.errors[:field_2]).to be_blank
+        end
+      end
     end
 
     describe "fields 3, 4, 5 => saledate" do