diff --git a/src/transport/smtp/client/async_connection.rs b/src/transport/smtp/client/async_connection.rs
index 3f525e7..2aeaa19 100644
--- a/src/transport/smtp/client/async_connection.rs
+++ b/src/transport/smtp/client/async_connection.rs
@@ -317,7 +317,7 @@ impl AsyncSmtpConnection {
                     } else {
                         Err(error::code(
                             response.code(),
-                            response.first_line().map(|s| s.to_owned()),
+                            Some(response.message().collect()),
                         ))
                     }
                 }
diff --git a/src/transport/smtp/client/connection.rs b/src/transport/smtp/client/connection.rs
index 657cb94..a72e646 100644
--- a/src/transport/smtp/client/connection.rs
+++ b/src/transport/smtp/client/connection.rs
@@ -285,7 +285,7 @@ impl SmtpConnection {
                     } else {
                         Err(error::code(
                             response.code(),
-                            response.first_line().map(|s| s.to_owned()),
+                            Some(response.message().collect()),
                         ))
                     };
                 }