diff --git a/REFERENCE.md b/REFERENCE.md
index bbc59bf3..04ffca69 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -124,6 +124,10 @@ The following parameters are available in the `postfix` class:
 * [`masquerade_domains`](#-postfix--masquerade_domains)
 * [`masquerade_exceptions`](#-postfix--masquerade_exceptions)
 * [`mta`](#-postfix--mta)
+* [`mta_virtual_content`](#-postfix--mta_virtual_content)
+* [`mta_virtual_source`](#-postfix--mta_virtual_source)
+* [`mta_transport_content`](#-postfix--mta_transport_content)
+* [`mta_transport_source`](#-postfix--mta_transport_source)
 * [`mydestination`](#-postfix--mydestination)
 * [`mynetworks`](#-postfix--mynetworks)
 * [`myorigin`](#-postfix--myorigin)
@@ -477,6 +481,42 @@ This option is mutually exclusive with the satellite Boolean.
 
 Default value: `false`
 
+##### <a name="-postfix--mta_virtual_content"></a>`mta_virtual_content`
+
+Data type: `Optional[String]`
+
+A free form string that defines the contents of the virtual file. Only used if mta is true.
+This parameter is mutually exclusive with mta_virtual_source.
+
+Default value: `undef`
+
+##### <a name="-postfix--mta_virtual_source"></a>`mta_virtual_source`
+
+Data type: `Optional[String]`
+
+A String whose value is a location for the source file to be used for the virtual file.
+Only used if mta is true. This parameter is mutually exclusive with mta_virtual_content.
+
+Default value: `undef`
+
+##### <a name="-postfix--mta_transport_content"></a>`mta_transport_content`
+
+Data type: `Optional[String]`
+
+A free form string that defines the contents of the transport file. Only used if mta is true.
+This parameter is mutually exclusive with mta_transport_source.
+
+Default value: `undef`
+
+##### <a name="-postfix--mta_transport_source"></a>`mta_transport_source`
+
+Data type: `Optional[String]`
+
+A String whose value is a location for the source file to be used for the transport file.
+Only used if mta is true. This parameter is mutually exclusive with mta_transport_content.
+
+Default value: `undef`
+
 ##### <a name="-postfix--mydestination"></a>`mydestination`
 
 Data type: `String`
diff --git a/manifests/init.pp b/manifests/init.pp
index eb012871..616552e7 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -187,6 +187,22 @@
 #   A Boolean to define whether to configure Postfix as a mail transfer agent.
 #   This option is mutually exclusive with the satellite Boolean.
 #
+# @param mta_virtual_content
+#   A free form string that defines the contents of the virtual file. Only used if mta is true.
+#   This parameter is mutually exclusive with mta_virtual_source.
+#
+# @param mta_virtual_source
+#   A String whose value is a location for the source file to be used for the virtual file.
+#   Only used if mta is true. This parameter is mutually exclusive with mta_virtual_content.
+#
+# @param mta_transport_content
+#   A free form string that defines the contents of the transport file. Only used if mta is true.
+#   This parameter is mutually exclusive with mta_transport_source.
+#
+# @param mta_transport_source
+#   A String whose value is a location for the source file to be used for the transport file.
+#   Only used if mta is true. This parameter is mutually exclusive with mta_transport_content.
+#
 # @param mydestination
 #   A string to define the mydestination parameter in main.cf (postconf(5)).
 #   Example: `example.com, foo.example.com`.
@@ -286,6 +302,10 @@
   Optional[Array[String[1]]]           $masquerade_domains    = undef,
   Optional[Array[String[1]]]           $masquerade_exceptions = undef,
   Boolean                              $mta                   = false,
+  Optional[String]                     $mta_virtual_content   = undef,
+  Optional[String]                     $mta_virtual_source    = undef,
+  Optional[String]                     $mta_transport_content = undef,
+  Optional[String]                     $mta_transport_source  = undef,
   String                               $mydestination         = '$myhostname, localhost.$mydomain, localhost',  # postfix_mydestination
   String                               $mynetworks            = '127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128', # postfix_mynetworks
   String                               $myorigin              = $facts['networking']['fqdn'],
@@ -371,6 +391,14 @@
     include postfix::ldap
   }
 
+  if $mta_virtual_content and $mta_virtual_source {
+    fail('You must provide either \'mta_virtual_content\' or \'mta_virtual_source\', not both.')
+  }
+
+  if $mta_transport_content and $mta_transport_source {
+    fail('You must provide either \'mta_transport_content\' or \'mta_transport_source\', not both.')
+  }
+
   if $mta {
     if $satellite {
       fail('enabling both the $mta and $satellite parameters is not supported. Please disable one.')
diff --git a/manifests/mta.pp b/manifests/mta.pp
index d3eb41a0..d46bb2af 100644
--- a/manifests/mta.pp
+++ b/manifests/mta.pp
@@ -51,10 +51,14 @@
   }
 
   postfix::hash { "${postfix::confdir}/virtual":
-    ensure => 'present',
+    ensure  => 'present',
+    content => $postfix::mta_virtual_content,
+    source  => $postfix::mta_virtual_source,
   }
 
   postfix::hash { "${postfix::confdir}/transport":
-    ensure => 'present',
+    ensure  => 'present',
+    content => $postfix::mta_transport_content,
+    source  => $postfix::mta_transport_source,
   }
 }