Index: Abstract.php
===================================================================
--- Abstract.php	(revision 19248)
+++ Abstract.php	(working copy)
@@ -361,6 +361,7 @@
         $this->_response = array();
         $cmd = '';
         $msg = '';
+        $err = '';
 
         if (!is_array($code)) {
             $code = array($code);
@@ -370,12 +371,17 @@
             $this->_response[] = $result = $this->_receive($timeout);
             sscanf($result, $this->_template, $cmd, $msg);
 
-            if ($cmd === null || !in_array($cmd, $code)) {
-                /**
-                 * @see Zend_Mail_Protocol_Exception
-                 */
-                require_once 'Zend/Mail/Protocol/Exception.php';
-                throw new Zend_Mail_Protocol_Exception($result);
+            if ($cmd === null || !in_array($cmd, $code) || $err) {
+                $err .= $result;
+
+                // don't throw exception until full response is read [ZF-8511]
+                if (strpos($msg, '-') !== 0) {
+                    /**
+                     * @see Zend_Mail_Protocol_Exception
+                     */
+                    require_once 'Zend/Mail/Protocol/Exception.php';
+                    throw new Zend_Mail_Protocol_Exception($err);
+                }
             }
 
         } while (strpos($msg, '-') === 0); // The '-' message prefix indicates an information string instead of a response string.