diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -349,6 +349,7 @@
     'PhutilPirateEnglishLocale' => 'internationalization/locales/PhutilPirateEnglishLocale.php',
     'PhutilPortugueseBrazilLocale' => 'internationalization/locales/PhutilPortugueseBrazilLocale.php',
     'PhutilPortuguesePortugalLocale' => 'internationalization/locales/PhutilPortuguesePortugalLocale.php',
+    'PhutilPostmarkFuture' => 'future/postmark/PhutilPostmarkFuture.php',
     'PhutilPregsprintfTestCase' => 'xsprintf/__tests__/PhutilPregsprintfTestCase.php',
     'PhutilProcessGroupDaemon' => 'daemon/torture/PhutilProcessGroupDaemon.php',
     'PhutilProseDiff' => 'utils/PhutilProseDiff.php',
@@ -986,6 +987,7 @@
     'PhutilPirateEnglishLocale' => 'PhutilLocale',
     'PhutilPortugueseBrazilLocale' => 'PhutilLocale',
     'PhutilPortuguesePortugalLocale' => 'PhutilLocale',
+    'PhutilPostmarkFuture' => 'FutureProxy',
     'PhutilPregsprintfTestCase' => 'PhutilTestCase',
     'PhutilProcessGroupDaemon' => 'PhutilTortureTestDaemon',
     'PhutilProseDiff' => 'Phobject',
diff --git a/src/future/postmark/PhutilPostmarkFuture.php b/src/future/postmark/PhutilPostmarkFuture.php
new file mode 100644
--- /dev/null
+++ b/src/future/postmark/PhutilPostmarkFuture.php
@@ -0,0 +1,85 @@
+<?php
+
+final class PhutilPostmarkFuture extends FutureProxy {
+
+  private $future;
+  private $accessToken;
+  private $method;
+  private $parameters;
+
+  public function __construct() {
+    parent::__construct(null);
+  }
+
+  public function setAccessToken($token) {
+    $this->accessToken = $token;
+    return $this;
+  }
+
+  public function setClientID($client_id) {
+    $this->clientID = $client_id;
+    return $this;
+  }
+
+  public function setMethod($method, array $parameters) {
+    $this->method = $method;
+    $this->parameters = $parameters;
+    return $this;
+  }
+
+  protected function getProxiedFuture() {
+    if (!$this->future) {
+      if ($this->accessToken === null) {
+        throw new PhutilInvalidStateException('setAccessToken');
+      }
+
+      if ($this->method === null || $this->parameters === null) {
+        throw new PhutilInvalidStateException('setMethod');
+      }
+
+      $uri = id(new PhutilURI('https://api.postmarkapp.com/'))
+        ->setPath('/'.$this->method);
+
+      $request_body = phutil_json_encode($this->parameters);
+
+      $future = id(new HTTPSFuture($uri))
+        ->setData($request_body)
+        ->setMethod('POST')
+        ->addHeader('X-Postmark-Server-Token', $this->accessToken)
+        ->addHeader('Accept', 'application/json')
+        ->addHeader('Content-Type', 'application/json');
+
+      $this->future = $future;
+    }
+
+    return $this->future;
+  }
+
+  protected function didReceiveResult($result) {
+    list($status, $body, $headers) = $result;
+
+    if ($status->isError()) {
+      throw $status;
+    }
+
+    try {
+      $data = phutil_json_decode($body);
+    } catch (PhutilJSONParserException $ex) {
+      throw new PhutilProxyException(
+        pht('Expected JSON response from Postmark.'),
+        $ex);
+    }
+
+    if (idx($data, 'ErrorCode')) {
+      $error = $data['ErrorCode'];
+      throw new Exception(
+        pht(
+          'Received error from Postmark: (%s) %s',
+          $error,
+          idx($data, 'Message')));
+    }
+
+    return $data;
+  }
+
+}