diff --git a/smtp.php b/smtp.php
index 45e6e97..5d456ad 100644
--- a/smtp.php
+++ b/smtp.php
@@ -159,6 +159,10 @@ class smtp
     $this->putLine ("DATA\r\n");
     if (substr ($completeMail, -2) !== "\r\n")
       $completeMail .= "\r\n";
+    // Dot on first column : must be doubled to not be detected as the end
+    // of SMTP transaction. The SMTP server will remove it before distribute
+    // http://tools.ietf.org/html/rfc5321#section-4.5.2
+    $completeMail = preg_replace ("#^\.#m", "..", $completeMail);
     return $this->putLine ("$completeMail.\r\n");
   }