From 719e5b217cbef2ef056c901f769f01eae0483a8f Mon Sep 17 00:00:00 2001
From: Winni Neessen <wn@neessen.net>
Date: Wed, 13 Nov 2024 23:02:30 +0100
Subject: [PATCH] Enhance error handling with ENHANCEDSTATUSCODES check

Added a check for the ENHANCEDSTATUSCODES extension and included error code and enhanced status code information in SendError. This helps in providing more detailed error reporting and troubleshooting.
---
 client_119.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/client_119.go b/client_119.go
index 093967e..b9931b8 100644
--- a/client_119.go
+++ b/client_119.go
@@ -27,8 +27,13 @@ import "errors"
 //   - An error that represents the sending result, which may include multiple SendErrors if
 //     any occurred; otherwise, returns nil.
 func (c *Client) Send(messages ...*Msg) error {
+	escSupport := false
+	if c.smtpClient != nil {
+		escSupport, _ = c.smtpClient.Extension("ENHANCEDSTATUSCODES")
+	}
 	if err := c.checkConn(); err != nil {
-		return &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err)}
+		return &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err),
+			errcode: errorCode(err), enhancedStatusCode: enhancedStatusCode(err, escSupport)}
 	}
 	var errs []*SendError
 	for id, message := range messages {