diff --git a/client_120.go b/client_120.go
index 012a4f7..38eb76e 100644
--- a/client_120.go
+++ b/client_120.go
@@ -27,8 +27,13 @@ import (
 // Returns:
 //   - An error that aggregates any SendErrors encountered during the sending process; otherwise, returns nil.
 func (c *Client) Send(messages ...*Msg) (returnErr error) {
+	escSupport := false
+	if c.smtpClient != nil {
+		escSupport, _ = c.smtpClient.Extension("ENHANCEDSTATUSCODES")
+	}
 	if err := c.checkConn(); err != nil {
-		returnErr = &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err)}
+		returnErr = &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err),
+			errcode: errorCode(err), enhancedStatusCode: enhancedStatusCode(err, escSupport)}
 		return
 	}