M mail/main.go → mail/main.go

@@ -447,7 +447,7 @@ if len(e.Cc) > 0 {
 		fmt.Fprintf(&buf, "Cc: %s\r\n", commaSep(e.Cc))
 	}
 	if !e.Date.IsZero() {
-		fmt.Fprintf(&buf, "Date: %s\r\n", e.Date)
+		fmt.Fprintf(&buf, "Date: %s\r\n", e.Date.Format(time.RFC1123Z))
 	}
 	if len(e.MessageID) > 0 {
 		fmt.Fprintf(&buf, "Message-ID: <%s>\r\n", e.MessageID)

M main.go → main.go

@@ -337,7 +337,6 @@ post := e
 	post.Sender = &mail.Address{l.Name, l.Address}
 	post.Bcc = recipients
 	post.Header["Return-Path"] = []string{"bounce-" + l.Address}
-	post.Header["Date"] = e.Header["Date"] // RFC 1123
 	post.Header["Precedence"] = []string{"list"}
 	post.Header["List-Id"] = []string{"<" + strings.Replace(l.Address, "@", ".", -1) + ">"}
 	post.Header["List-Post"] = []string{"<mailto:" + l.Address + ">"}