diff --git a/src/auth/PhutilLDAPAuthAdapter.php b/src/auth/PhutilLDAPAuthAdapter.php
--- a/src/auth/PhutilLDAPAuthAdapter.php
+++ b/src/auth/PhutilLDAPAuthAdapter.php
@@ -11,6 +11,7 @@
   private $baseDistinguishedName;
   private $searchAttributes = array();
   private $usernameAttribute;
+  private $emailAttribute;
   private $realNameAttributes = array();
   private $ldapVersion = 3;
   private $ldapReferrals;
@@ -59,6 +60,11 @@
     return $this;
   }
 
+  public function setEmailAttribute($email_attribute) {
+    $this->emailAttribute = $email_attribute;
+    return $this;
+  }
+
   public function setRealNameAttributes(array $attributes) {
     $this->realNameAttributes = $attributes;
     return $this;
@@ -153,6 +159,13 @@
   }
 
   public function readLDAPRecordEmail(array $record) {
+    $result = '';
+    if ($this->emailAttribute) {
+      $result = $this->readLDAPData($record, $this->emailAttribute);
+    }
+    if (strlen(trim($result))) {
+      return $result;
+    }
     return $this->readLDAPData($record, 'mail');
   }