diff -r 81ab5ffa6863 roundup/configuration.py
--- a/roundup/configuration.py	Wed Apr 24 23:46:57 2013 -0400
+++ b/roundup/configuration.py	Sat Jun 08 23:41:58 2013 -0400
@@ -675,6 +675,9 @@
             "This domain is added to those config items if they don't\n"
             "explicitly include a domain.\n"
             "Do not include the '@' symbol."),
+        (Option, "sendmail", NODEFAULT,
+            "SENDMAIL binary to use (optional)",
+            ["SENDMAIL"],),
         (Option, "host", NODEFAULT,
             "SMTP mail host that roundup will use to send mail",
             ["MAILHOST"],),
diff -r 81ab5ffa6863 roundup/mailer.py
--- a/roundup/mailer.py	Wed Apr 24 23:46:57 2013 -0400
+++ b/roundup/mailer.py	Sat Jun 08 23:41:58 2013 -0400
@@ -2,7 +2,7 @@
 """
 __docformat__ = 'restructuredtext'
 
-import time, quopri, os, socket, smtplib, re, sys, traceback, email
+import time, quopri, os, socket, smtplib, re, sys, traceback, email, subprocess
 
 from cStringIO import StringIO
 
@@ -265,6 +265,9 @@
 
         if not sender:
             sender = self.config.ADMIN_EMAIL
+
+        sendmail=self.config.SENDMAIL
+
         if self.debug:
             # don't send - just write to a file, use unix from line so
             # that resulting file can be openened in a mailer
@@ -273,6 +276,28 @@
             open(self.debug, 'a').write('%s\nFROM: %s\nTO: %s\n%s\n\n' %
                                         (unixfrm, sender,
                                          ', '.join(to), message))
+        elif sendmail:
+            # open sendmail like process pass to on the command line
+            # write the message to stdin and then close stdin to
+            # indicate the message is done
+            # get exit code and report output/error and raise error
+            #
+            # If sendmail returns code 75 when used this way
+            #
+            #   #define EX_TEMPFAIL     75
+            #           /* temp failure; user is invited to retry */
+            #
+            # ignore the error since the email has been queued and
+            # we have suceeded as far as the submission is concerned.
+            mailer = subprocess.Popen([sendmail, ', '.join(to)], stdin=subprocess.PIPE, stderr=subprocess.PIPE)
+            print >>mailer.stdin, message
+            mailer.stdin.close()
+            if mailer.wait():
+                if mailer.returncode != 75:
+                    mailer_err = mailer.stderr.read(2048)
+                    raise MessageSendError("Error: couldn't send email: "
+                          "%s returned %s - %s"%(sendmail,
+                                    mailer.returncode, mailer_err))
         else:
             # now try to send the message
             try: