diff --git a/smtpd/manifests/init.pp b/smtpd/manifests/init.pp
index 49c6117..c03b6dc 100644
--- a/smtpd/manifests/init.pp
+++ b/smtpd/manifests/init.pp
@@ -18,6 +18,9 @@
 # $maildir:
 #   Directory in user home for INBOX. Defaults to "Mail".
 #
+# $config:
+#   Path to custom configuration file.
+#
 # $custom:
 #   Array of custom accept/reject rules.
 #
@@ -39,6 +42,7 @@ class smtpd(
   $listen=false,
   $gecos=true,
   $maildir="Mail",
+  $config=undef,
   $custom=undef,
   $domains=undef,
   $virtuals=undef,
@@ -130,6 +134,15 @@ class smtpd(
 
   include ssl
 
+  if $config {
+    $content = undef
+  } else {
+    $content = $listen ? {
+      true    => template("smtpd/server.conf.erb"),
+      default => template("smtpd/client.conf.erb"),
+    }
+  }
+
   file { "${confdir}/smtpd.conf":
     ensure  => present,
     mode    => "0644",
@@ -138,10 +151,8 @@ class smtpd(
       "openbsd" => "wheel",
       default   => "root",
     },
-    content => $listen ? {
-      true    => template("smtpd/server.conf.erb"),
-      default => template("smtpd/client.conf.erb"),
-    },
+    source  => $config,
+    content => $content,
     notify  => Service[$service],
   }
 
@@ -154,21 +165,7 @@ class smtpd(
     },
   }
 
-  if $listen == true {
-    include procmail
-
-    procmail::rc { "00-default.rc":
-      content => "MAILDIR=\$HOME/${maildir}\nDEFAULT=\$MAILDIR/INBOX\n",
-    }
-
-    file { [ "/root/${maildir}", "/etc/skel/${maildir}" ]:
-      ensure => directory,
-      mode   => "0700",
-      owner  => "root",
-      group  => "wheel",
-      before => Service["smtpd"],
-    }
-
+  if $listen == true or $config {
     file { "${ssl::private}/smtpd.key":
       ensure => present,
       mode   => "0600",
@@ -185,6 +182,22 @@ class smtpd(
       source => $ssl_cert,
       notify => Service["smtpd"],
     }
+  }
+
+  if $listen == true {
+    include procmail
+
+    procmail::rc { "00-default.rc":
+      content => "MAILDIR=\$HOME/${maildir}\nDEFAULT=\$MAILDIR/INBOX\n",
+    }
+
+    file { [ "/root/${maildir}", "/etc/skel/${maildir}" ]:
+      ensure => directory,
+      mode   => "0700",
+      owner  => "root",
+      group  => "wheel",
+      before => Service["smtpd"],
+    }
 
     if $gecos == true {
       file { "/usr/local/sbin/generate-smtpd-gecos.sh":