diff --git a/postgrey_whitelist_clients b/postgrey_whitelist_clients
index aa3e2dc..4ff6c4e 100644
--- a/postgrey_whitelist_clients
+++ b/postgrey_whitelist_clients
@@ -307,4 +307,6 @@ dhosting.com
 cloudflare.net
 me.com
 mimecast.com
-sparkpostmail.com
\ No newline at end of file
+sparkpostmail.com
+# 2025-06-22: lettermint.co (reported by @bjarn)
+lmta.net