# Issue configuring reply by email: 553 5.7.1 Sender address rejected: not owned by user **URL:** \ **Category:** Product Support\ **Created:** [6월 10, 2019, 9:21오전 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:** 1
**Author:** ![degrees380](https://avatars.discourse-cdn.com/v4/letter/d/22d042/32.png) [@degrees380](https://meta.discourse.org/u/degrees380)\ **Post date:** [6월 10, 2019, 9:21오전 UTC](https://meta.discourse.org/t/issue-configuring-reply-by-email-553-5-7-1-sender-address-rejected-not-owned-by-user/119897/1 "2019-06-10T09:21:46Z")
Hello! I’m prettu new to discourse admin so please forgive me if I’m asking something already answered (I already searched for similar issues but did not foud a solution). I configured our instance to deliver notification messages via authenticated SMTP: I tested it several times and it works; the notification email address is forum@HIDDEN.TLD As soon as I configure the “reply by email” address to our chosen reply address - forumreply+%{reply\_key}@HIDDEN - and set `replay by email enabled`, all our email notifications _and_ test messages stops to be accepted by our SMTP server whith this error message: ```plaintext 553 5.7.1 : Sender address rejected: not owned by user forum@HIDDEN ``` I understand I cannot use `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) I’m not able to have a look at the source of the failing message, so I cannot check how email headers are configured. Please: can someone confirm that the “reply by email” settings I did are fine? How can I have a look to the headers of the rejected emails, are they saved in some log file (I cannot find it)? If the “reply by email” config is fine then I should check out why our SMTP server is rejecting legit outgonig email. Thanks for any suggestion! Best regards. --- _[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)._