diff --git a/email.go b/email.go
index 9d1687e..7ad606e 100644
--- a/email.go
+++ b/email.go
@@ -27,21 +27,36 @@ func SendMail(addr, from, subject, body string, to []string) error {
 
 	c, err := smtp.Dial(addr)
 	if err != nil {
+		if *debugFlag {
+			log.Printf("SendMail : smtp.Dial (%s)", err)
+		}
 		return err
 	}
+
 	defer c.Close()
+
 	if err = c.Mail(r.Replace(from)); err != nil {
+		if *debugFlag {
+			log.Printf("SendMail : client.Mail (%s)", err)
+		}
 		return err
 	}
+
 	for i := range to {
 		to[i] = r.Replace(to[i])
 		if err = c.Rcpt(to[i]); err != nil {
+			if *debugFlag {
+				log.Printf("SendMail : client.Rcpt (%s)", err)
+			}
 			return err
 		}
 	}
 
 	w, err := c.Data()
 	if err != nil {
+		if *debugFlag {
+			log.Printf("SendMail : client.Data (%s)", err)
+		}
 		return err
 	}
 
@@ -58,11 +73,23 @@ func SendMail(addr, from, subject, body string, to []string) error {
 
 	_, err = w.Write([]byte(msg))
 	if err != nil {
+		if *debugFlag {
+			log.Printf("SendMail : writer.Write (%s)", err)
+		}
 		return err
 	}
+
 	err = w.Close()
 	if err != nil {
+		if *debugFlag {
+			log.Printf("SendMail : writer.Close (%s)", err)
+		}
 		return err
 	}
-	return c.Quit()
+
+	err = c.Quit()
+	if *debugFlag {
+		log.Printf("SendMail : client.Quit (%s)", err)
+	}
+	return err
 }
diff --git a/version.go b/version.go
index b4c7be6..0313f71 100644
--- a/version.go
+++ b/version.go
@@ -1,6 +1,6 @@
 // Code generated by version.sh (@generated) DO NOT EDIT.
 package main
-var githash = "4937155"
-var buildstamp = "2022-06-19_04:13:42"
-var commits = "44"
-var version = "4937155-b44 - 2022-06-19_04:13:42"
+var githash = "db05204"
+var buildstamp = "2022-06-19_04:18:29"
+var commits = "45"
+var version = "db05204-b45 - 2022-06-19_04:18:29"