diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index b0cc94cb2..c9bb0b95b 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -445,7 +445,7 @@ class Attachment < ActiveRecord::Base
     extension = extension.downcase.sub(/\A\.+/, '')
 
     unless extensions.is_a?(Array)
-      extensions = extensions.to_s.split(",").map(&:strip)
+      extensions = extensions.to_s.split(/[\s,]+/)
     end
     extensions = extensions.map {|s| s.downcase.sub(/\A\.+/, '')}.reject(&:blank?)
     extensions.include?(extension)
diff --git a/app/models/mail_handler.rb b/app/models/mail_handler.rb
index 4259eacb2..aa1cb2a0a 100644
--- a/app/models/mail_handler.rb
+++ b/app/models/mail_handler.rb
@@ -308,7 +308,7 @@ class MailHandler < ActionMailer::Base
 
   # Returns false if the +attachment+ of the incoming email should be ignored
   def accept_attachment?(attachment)
-    @excluded ||= Setting.mail_handler_excluded_filenames.to_s.split(',').map(&:strip).reject(&:blank?)
+    @excluded ||= Setting.mail_handler_excluded_filenames.to_s.split(/[\s,]+/).reject(&:blank?)
     @excluded.each do |pattern|
       if Setting.mail_handler_enable_regex_excluded_filenames?
         regexp = %r{\A#{pattern}\z}i
diff --git a/test/unit/attachment_test.rb b/test/unit/attachment_test.rb
index 5adfc5116..965b0ce25 100644
--- a/test/unit/attachment_test.rb
+++ b/test/unit/attachment_test.rb
@@ -139,7 +139,7 @@ class AttachmentTest < ActiveSupport::TestCase
   end
 
   def test_extension_should_be_validated_against_denied_extensions
-    with_settings :attachment_extensions_denied => "txt, png" do
+    with_settings :attachment_extensions_denied => "txt, png\r\ncsv" do
       a = Attachment.new(:container => Issue.find(1),
                          :file => mock_file_with_options(:original_filename => "test.jpeg"),
                          :author => User.find(1))
@@ -153,11 +153,11 @@ class AttachmentTest < ActiveSupport::TestCase
   end
 
   def test_valid_extension_should_be_case_insensitive
-    with_settings :attachment_extensions_allowed => "txt, Png" do
+    with_settings :attachment_extensions_allowed => "txt, Png\r\ncsv" do
       assert Attachment.valid_extension?(".pnG")
       assert !Attachment.valid_extension?(".jpeg")
     end
-    with_settings :attachment_extensions_denied => "txt, Png" do
+    with_settings :attachment_extensions_denied => "txt, Png\r\ncsv" do
       assert !Attachment.valid_extension?(".pnG")
       assert Attachment.valid_extension?(".jpeg")
     end
diff --git a/test/unit/mail_handler_test.rb b/test/unit/mail_handler_test.rb
index 07532d82e..65c7750e3 100644
--- a/test/unit/mail_handler_test.rb
+++ b/test/unit/mail_handler_test.rb
@@ -1157,7 +1157,7 @@ class MailHandlerTest < ActiveSupport::TestCase
   end
 
   def test_attachments_that_match_mail_handler_excluded_filenames_should_be_ignored
-    with_settings :mail_handler_excluded_filenames => "*.vcf,\n *.jpg" do
+    with_settings :mail_handler_excluded_filenames => "*.vcf,\n *.jpg\r\n*.csv" do
       issue = submit_email('ticket_with_attachment.eml', :issue => {:project => 'onlinestore'})
       assert issue.is_a?(Issue)
       assert !issue.new_record?
@@ -1166,7 +1166,7 @@ class MailHandlerTest < ActiveSupport::TestCase
   end
 
   def test_attachments_that_match_mail_handler_excluded_filenames_by_regex_should_be_ignored
-    with_settings :mail_handler_excluded_filenames => '.+\.vcf,(pa|nut)ella\.jpg',
+    with_settings :mail_handler_excluded_filenames => ".+\\.vcf,(pa|nut)ella\\.jpg\r\n.+\\.csv",
                   :mail_handler_enable_regex_excluded_filenames => 1 do
       issue = submit_email('ticket_with_attachment.eml', :issue => {:project => 'onlinestore'})
       assert issue.is_a?(Issue)