diff --git a/src/transport/smtp/client/mod.rs b/src/transport/smtp/client/mod.rs
index a01b7b7..3503756 100644
--- a/src/transport/smtp/client/mod.rs
+++ b/src/transport/smtp/client/mod.rs
@@ -39,7 +39,9 @@ pub(super) use self::tls::current::InnerTlsParameters;
 pub use self::tls::current::TlsVersion;
 pub use self::{
     connection::SmtpConnection,
-    tls::current::{Certificate, Identity, Tls, TlsParameters, TlsParametersBuilder},
+    tls::current::{
+        Certificate, CertificateStore, Identity, Tls, TlsParameters, TlsParametersBuilder,
+    },
 };
 
 #[cfg(any(feature = "tokio1", feature = "async-std1"))]