diff --git a/src/smtp.rs b/src/smtp.rs
index 6d52be053a..6707dca59d 100644
--- a/src/smtp.rs
+++ b/src/smtp.rs
@@ -68,6 +68,8 @@ impl Smtp {
             // separate task to avoid waiting for reply or timeout.
             task::spawn(async move { transport.quit().await });
         }
+        self.transport_id = None;
+        self.from = None;
         self.last_success = None;
     }