diff --git a/app/models/channel/filter/service_now_check.rb b/app/models/channel/filter/service_now_check.rb
index 3f24d40ff..281ace9d2 100644
--- a/app/models/channel/filter/service_now_check.rb
+++ b/app/models/channel/filter/service_now_check.rb
@@ -66,17 +66,10 @@ returns:
 =end
 
   def self.source_name(from:)
-    result = nil
-    begin
-      Mail::AddressList.new(from).addresses.each do |line|
-        result = "ServiceNow-#{line.address}"
-        break
-      end
-    rescue
-      Rails.logger.info "Unable to parse email address in '#{from}'"
-    end
-
-    result
+    address = Mail::AddressList.new(from).addresses.first.address.downcase
+    "ServiceNow-#{address}"
+  rescue => e
+    Rails.logger.info "Unable to parse email address in '#{from}': #{e.message}"
   end
 
   def self.from_sync_entry(mail:, source_name:, source_id:)
diff --git a/spec/models/channel/email_parser_spec.rb b/spec/models/channel/email_parser_spec.rb
index 9475ac498..dd2b35598 100644
--- a/spec/models/channel/email_parser_spec.rb
+++ b/spec/models/channel/email_parser_spec.rb
@@ -1024,6 +1024,15 @@ RSpec.describe Channel::EmailParser, type: :model do
         it 'adds Article to existing Ticket' do
           expect { described_class.new.process({}, raw_mail) }.to change { ticket.reload.articles.count }
         end
+
+        context 'key insensitive sender address' do
+
+          let(:raw_mail) { super().gsub('example@service-now.com', 'Example@Service-Now.com') }
+
+          it 'adds Article to existing Ticket' do
+            expect { described_class.new.process({}, raw_mail) }.to change { ticket.reload.articles.count }
+          end
+        end
       end
     end