diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index d6fcbd455..9f08bbf24 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -5,6 +5,7 @@ Security:
 
 Bugs:
 * #633 – Cope with message parts that have an empty Content-Type (ThomasKoppensteiner, zeepeeare)
+* #689 - Fix Exim delivery method broken by #477 in 2.5.4. (jethrogb)
 
 == Version 2.5.4 - Tue May 14 14:45:00 +1100 2013 Mikel Lindsaar <mikel@lindsaar.net>
 
diff --git a/lib/mail/network/delivery_methods/exim.rb b/lib/mail/network/delivery_methods/exim.rb
index f3b5800f9..36cc848fd 100644
--- a/lib/mail/network/delivery_methods/exim.rb
+++ b/lib/mail/network/delivery_methods/exim.rb
@@ -36,17 +36,13 @@ module Mail
   #
   #   mail.deliver!
   class Exim < Sendmail
-    def initialize(values)
-      self.settings = { :location       => '/usr/sbin/exim',
-                        :arguments      => '-i -t' }.merge(values)
-    end
+    DEFAULTS = {
+      :location   => '/usr/sbin/exim',
+      :arguments  => '-i -t'
+    }
 
-    def self.call(path, arguments, destinations, mail)
-      popen "#{path} #{arguments}" do |io|
-        io.puts mail.encoded.to_lf
-        io.flush
-      end
+    def self.call(path, arguments, destinations, encoded_message)
+      super path, arguments, nil, encoded_message
     end
-
   end
 end
diff --git a/lib/mail/network/delivery_methods/sendmail.rb b/lib/mail/network/delivery_methods/sendmail.rb
index 3a4e4f03c..3aa571ca1 100644
--- a/lib/mail/network/delivery_methods/sendmail.rb
+++ b/lib/mail/network/delivery_methods/sendmail.rb
@@ -37,11 +37,15 @@ module Mail
   #
   #   mail.deliver!
   class Sendmail
+    DEFAULTS = {
+      :location   => '/usr/sbin/sendmail',
+      :arguments  => '-i'
+    }
+
     attr_accessor :settings
 
     def initialize(values)
-      self.settings = { :location       => '/usr/sbin/sendmail',
-                        :arguments      => '-i' }.merge(values)
+      self.settings = self.class::DEFAULTS.merge(values)
     end
 
     def deliver!(mail)
diff --git a/spec/mail/network/delivery_methods/exim_spec.rb b/spec/mail/network/delivery_methods/exim_spec.rb
index 9017563cb..351c4ba98 100644
--- a/spec/mail/network/delivery_methods/exim_spec.rb
+++ b/spec/mail/network/delivery_methods/exim_spec.rb
@@ -26,11 +26,9 @@
       to      'marcel@test.lindsaar.net, bob@test.lindsaar.net'
       subject 'invalid RFC2822'
     end
-    
-    Mail::Exim.should_receive(:call).with('/usr/sbin/exim', 
-                                          '-i -t -f "roger@test.lindsaar.net" --', 
-                                          '"marcel@test.lindsaar.net" "bob@test.lindsaar.net"', 
-                                          mail.encoded)
+
+    Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', '-i -t -f "roger@test.lindsaar.net" --', nil, mail.encoded)
+
     mail.deliver!
   end
 
@@ -50,14 +48,10 @@
         message_id "<1234@test.lindsaar.net>"
         body "body"
       end
-      
-      Mail::Exim.should_receive(:call).with('/usr/sbin/exim',
-                                                '-i -t -f "return@test.lindsaar.net" --', 
-                                                '"to@test.lindsaar.net"', 
-                                                mail.encoded)
-                                                
-      mail.deliver
 
+      Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', '-i -t -f "return@test.lindsaar.net" --', nil, mail.encoded)
+
+      mail.deliver
     end
 
     it "should use the sender address is no return path is specified" do
@@ -74,14 +68,9 @@
         body "body"
       end
 
-      Mail::Exim.should_receive(:call).with('/usr/sbin/exim',
-                                                '-i -t -f "sender@test.lindsaar.net" --', 
-                                                '"to@test.lindsaar.net"', 
-                                                mail.encoded)
-
       mail.deliver
     end
-    
+
     it "should use the from address is no return path or sender are specified" do
       Mail.defaults do
         delivery_method :exim
@@ -95,10 +84,8 @@
         body "body"
       end
 
-      Mail::Exim.should_receive(:call).with('/usr/sbin/exim',
-                                                '-i -t -f "from@test.lindsaar.net" --', 
-                                                '"to@test.lindsaar.net"', 
-                                                mail.encoded)
+      Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', '-i -t -f "from@test.lindsaar.net" --', nil, mail.encoded)
+
       mail.deliver
     end
 
@@ -115,10 +102,8 @@
         body 'body'
       end
 
-      Mail::Exim.should_receive(:call).with('/usr/sbin/exim',
-                                                '-i -t -f "\"from+suffix test\"@test.lindsaar.net" --',
-                                                '"to@test.lindsaar.net"',
-                                                mail.encoded)
+      Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', '-i -t -f "\"from+suffix test\"@test.lindsaar.net" --', nil, mail.encoded)
+
       mail.deliver
     end
 
@@ -132,10 +117,8 @@
         from 'from@test.lindsaar.net'
       end
 
-      Mail::Exim.should_receive(:call).with('/usr/sbin/exim',
-                                                '-i -t -f "from@test.lindsaar.net" --',
-                                                '"-hyphen@test.lindsaar.net"',
-                                                mail.encoded)
+      Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', '-i -t -f "from@test.lindsaar.net" --', nil, mail.encoded)
+
       mail.deliver
     end
   end
@@ -151,10 +134,8 @@
       subject 'invalid RFC2822'
     end
     
-    Mail::Exim.should_receive(:call).with('/usr/sbin/exim', 
-                                              ' -f "from@test.lindsaar.net" --',
-                                              '"marcel@test.lindsaar.net" "bob@test.lindsaar.net"', 
-                                              mail.encoded)
+    Mail::Sendmail.should_receive(:call).with('/usr/sbin/exim', ' -f "from@test.lindsaar.net" --', nil, mail.encoded)
+
     mail.deliver!
   end
 
@@ -168,11 +149,13 @@
       to      'marcel@test.lindsaar.net'
       subject 'invalid RFC2822'
     end
-    
-    Mail::Exim.should_receive(:call).with('/usr/sbin/exim', 
-                                              " -f \"\\\"foo\\\\\\\"\\;touch /tmp/PWNED\\;\\\\\\\"\\\"@blah.com\" --",
-                                              '"marcel@test.lindsaar.net"', 
-                                              mail.encoded)
+
+    Mail::Sendmail.should_receive(:call).with(
+      '/usr/sbin/exim',
+      " -f \"\\\"foo\\\\\\\"\\;touch /tmp/PWNED\\;\\\\\\\"\\\"@blah.com\" --",
+      nil,
+      mail.encoded)
+
     mail.deliver!
   end