# Issue configuring reply by email: 553 5.7.1 Sender address rejected: not owned by user
**URL:** https://meta.discourse.org/t/issue-configuring-reply-by-email-553-5-7-1-sender-address-rejected-not-owned-by-user/119897
**Category:** Support
**Created:** [10.Июнь.2019 09:21:45 UTC](https://meta.discourse.org/t/issue-configuring-reply-by-email-553-5-7-1-sender-address-rejected-not-owned-by-user/119897 "2019-06-10T09:21:45Z")
**Posts on this page:** 1
**Showing post:** 3
### Author:  [@degrees380](https://meta.discourse.org/u/degrees380)
#### Post date: [10.Июнь.2019 13:27:45 UTC](https://meta.discourse.org/t/issue-configuring-reply-by-email-553-5-7-1-sender-address-rejected-not-owned-by-user/119897/3 "2019-06-10T13:27:45Z")
Hello Jay,
thank you for your quick reply,
Jay Pfaffman via Discourse Meta [meta@discoursemail.com](mailto:meta@discoursemail.com) writes:
> Your mail server doesn’t like the address. You need to figure out how
> to allow the user that is sending mail be allowed to use that
> address. It may be that it doesn’t like the + addressing? But I
> suspect it’s that it’s denying forumreply.
Thanks to your reply I can now have a look to the relevant email headers
`meta.discourse.org` used in notification email sent to me:
```plaintext
Return-Path:
Message-ID:
In-Reply-To:
References:
5.7.1 Sender address rejected: not owned by user
```
So it’s clear that the `meta.discourse.org` instance is using **the same**
email address both for the `notification email` and the `reply by email address` template: am I misreading the headers?
In other words it seems to me that `meta.discourse.org` is using
```plaintext
reply by email address: meta+%{reply_key}@discoursemail.com
```
This means that the `Return-Path` is the same of `From`: this is why any
authendicated SMTP server will never complain about this.
In our instance, instead, we **cannot use**
```plaintext
reply by email address: forum+%{reply_key}@HIDDEN
```
since
[Notification email cannot be the same as reply by email](https://meta.discourse.org/t/notification-email-cannot-be-the-same-as-reply-by-email/28840);
in fact I get a validation error if I try:
```plaintext
reply_by_email_address: Value must contain '%%{reply_key}' and be different from the notification email.
```
(why the double %%?)
If I use
```plaintext
forum+%%{reply_key}@HIDDEN
```
(note double %%) our Discourse instance is able to send the email via
our SMTP server, **but** the headers are different from the ones I
observe from `meta.discourse.org`
```plaintext
Return-Path:
```
Please ho can I set our instance to have the same behaviour as
`meta.discourse.org` regarding `reply by email` delivery?
To be clear, I need to understand how to configure things in order to
have this set of email headers:
```plaintext
Return-Path:
```
the same way `meta.discourse.org` instance is able to generate?
Thanks for your support.
degrees380
---
_[View the full topic](https://meta.discourse.org/t/issue-configuring-reply-by-email-553-5-7-1-sender-address-rejected-not-owned-by-user/119897)._