diff --git a/app/assets/javascripts/app/lib/app_post/utils.coffee b/app/assets/javascripts/app/lib/app_post/utils.coffee
index 810bee3eb..f29dbdfa6 100644
--- a/app/assets/javascripts/app/lib/app_post/utils.coffee
+++ b/app/assets/javascripts/app/lib/app_post/utils.coffee
@@ -816,21 +816,22 @@ class App.Utils
   # check if attachment is referenced in message
   @checkAttachmentReference: (message) ->
     return false if !message
+
+    # remove blockquote from message, check only the unquoted content
+    tmp = $('<div>' + message + '</div>')
+    tmp.find('blockquote').remove()
+    text = tmp.text()
+
     matchwords = ['Attachment', 'attachment', 'Attached', 'attached', 'Enclosed', 'enclosed', 'Enclosure', 'enclosure']
     for word in matchwords
-
       # en
       attachmentTranslatedRegExp = new RegExp("\\W#{word}\\W", 'i')
-
-      # remove blockquote, check only the unquoted content
-      return word if message.replace(/(<blockquote>.*<\/blockquote>)/g, "").match(attachmentTranslatedRegExp)
+      return word if text.match(attachmentTranslatedRegExp)
 
       # user locale
       attachmentTranslated = App.i18n.translateContent(word)
       attachmentTranslatedRegExp = new RegExp("\\W#{attachmentTranslated}\\W", 'i')
-
-      # remove blockquote, check only the unquoted content
-      return attachmentTranslated if message.replace(/(<blockquote>.*<\/blockquote>)/g, "").match(attachmentTranslatedRegExp)
+      return attachmentTranslated if text.match(attachmentTranslatedRegExp)
     false
 
   # human readable file size
diff --git a/public/assets/tests/html_utils.js b/public/assets/tests/html_utils.js
index acb98b33c..5b3bd77c3 100644
--- a/public/assets/tests/html_utils.js
+++ b/public/assets/tests/html_utils.js
@@ -1282,7 +1282,17 @@ test("check check attachment reference", function() {
   verify = App.Utils.checkAttachmentReference(message)
   equal(verify, result)
 
-  message = '<div>Hi Test,</div><div><blockquote>On Monday, 22 July 2019, 14:07:54, Test User wrote:<br><br>Test attachment<br></blockquote></div>'
+  message = '<div>Hi Test,</div><div><blockquote>On Monday, 22 July 2019, 14:07:54, Test User wrote:<br><br>Test attachment <br></blockquote></div>'
+  result = false
+  verify = App.Utils.checkAttachmentReference(message)
+  equal(verify, result)
+
+  message = '<div>Hi Test,</div><div><blockquote type="cite">cite attachment </blockquote></div>'
+  result = false
+  verify = App.Utils.checkAttachmentReference(message)
+  equal(verify, result)
+
+  message = '<div>Hi Test,</div><div><blockquote class="ecxgmail_quote">ecxgmail_quote attachment </blockquote></div>'
   result = false
   verify = App.Utils.checkAttachmentReference(message)
   equal(verify, result)