Added option to ignore banner checks

modules/exploits/linux/smtp/exim4_dovecot_exec.rb

@@ -61,6 +61,11 @@ class Metasploit3 < Msf::Exploit::Remote
         OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60])
       ], self.class)
 
+      register_advanced_options(
+      [
+        OptBool.new("SkipVersionCheck", [true, "Specify this to skip the version check", false])
+      ], self.class)
+
       deregister_options('MAILFROM')
   end
 
@@ -140,7 +145,7 @@ class Metasploit3 < Msf::Exploit::Remote
     connect
 
     print_status("#{rhost}:#{rport} - Server: #{self.banner.to_s.strip}")
-    if self.banner.to_s !~ /Exim /
+    if not datastore['SkipVersionCheck'] and self.banner.to_s !~ /Exim /
       disconnect
       fail_with(Failure::NoTarget, "#{rhost}:#{rport} - The target server is not running Exim!")
     end