Use config option to prevent sender based auto responses.

app/models/ticket.rb

@@ -668,7 +668,14 @@ perform changes on ticket
           next if user.email !~ /@/
 
           # do not sent notifications to this recipients
+          send_no_auto_response_reg_exp = Setting.get('send_no_auto_response_reg_exp')
+          begin
+            next if user.email =~ /#{send_no_auto_response_reg_exp}/i
+          rescue => e
+            logger.error "ERROR: Invalid regex '#{send_no_auto_response_reg_exp}' in setting send_no_auto_response_reg_exp"
+            logger.error 'ERROR: ' + e.inspect
             next if user.email =~ /(mailer-daemon|postmaster|abuse|root)@.+?\..+?/i
+          end
 
           email = user.email.downcase.strip
           next if recipient_already[email]

test/fixtures/ticket_trigger/mail3.box

@@ -0,0 +1,17 @@
+From: Abuse <abuse@example.com>
+To: me@example.com
+Content-Type: text/plain;
+  charset=iso-8859-1
+Content-Transfer-Encoding: quoted-printable
+Subject: =?iso-8859-1?Q?aa=E4=F6=FC=DFad_asd?=
+X-Universally-Unique-Identifier: d12c15d2-e6d6-4ccd-86c7-abc2c3d0a2a2
+Date: Fri, 4 May 2012 14:01:03 +0200
+Message-Id: <BC182994-03FA-4DC5-8202-98CBFACA0887-1@example.com>
+Mime-Version: 1.0 (Apple Message framework v1257)
+
+=E4=F6=FC=DF ad asd
+
+-Martin
+
+--
+Old programmers never die. They just branch to a new address.

test/unit/ticket_trigger_test.rb

@@ -604,6 +604,13 @@ class TicketTriggerTest < ActiveSupport::TestCase
     assert_equal('new', ticket_p.state.name)
     assert_equal(1, ticket_p.articles.count)
 
+    # process mail with abuse@ (no auto response)
+    content = IO.binread('test/fixtures/ticket_trigger/mail3.box')
+    ticket_p, article_p, user_p, mail = Channel::EmailParser.new.process({}, content)
+
+    assert_equal('new', ticket_p.state.name)
+    assert_equal(1, ticket_p.articles.count)
+
     Trigger.destroy_all
   end