diff --git a/dictionaries/ImpureFunctionsList.php b/dictionaries/ImpureFunctionsList.php
index 25f94ef5298..18ff96051a0 100644
--- a/dictionaries/ImpureFunctionsList.php
+++ b/dictionaries/ImpureFunctionsList.php
@@ -254,4 +254,6 @@
     'openssl_pkcs12_export_to_file' => true,
     'openssl_pkey_export_to_file' => true,
     'openssl_x509_export_to_file' => true,
+    // mail
+    'mail' => true,
 ];