Sending email to private.email from transferred app

Privacy & Security Sign in with Apple
lfcj OP
Created 2d
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Goal

I want to reply to feedback from customers who signed up using a private.relay account.

Problem

I am getting this error when sending an email:

Reporting-MTA: dns; mailfout.stl.internal
X-Postfix-Queue-ID: B87481D0015B
X-Postfix-Sender: rfc822; hello@mydomain.com
Arrival-Date: Fri,  7 Nov 2025 03:37:29 -0500 (EST)

Final-Recipient: rfc822; xxxx@privaterelay.appleid.com
Original-Recipient: rfc822;xxxx@privaterelay.appleid.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; smtp3.privaterelay.appleid.com
Diagnostic-Code: smtp; 550 5.1.1 <hello@mydomain.com>: unauthorized sender

What have I done?

  • I have configured mydomain.com in the Email Configuration Service inside of apple, as well as the email hello@mydomain.com.
  • Using https://www.mail-tester.com/, I could confirm that the
- [SPF] Your server 202.12.124.158 is authorized to use hello@mydomain.com
- Your DKIM signature is valid
- Your message passed the DMARC test

My hunch

This app was transferred and the previous owner did not have the email configuration set up.

The emails I am writing messages to signed up at that time.

Questions:

  • If I rescue the old account and set up the email configuration, would it work?

  • Is there any other tip I could try to apply?

Answered by DTS Engineer in 866904022

Hi @lfcj,

There are two common reasons for this issue to occur after an app transfer:

  • the app was the only app from the transferring team to use the Private Email Relay Service, which prevents communication to those users
  • the users were not migrated to the recipient account after app transfer

To resolve the latter, please see the following technote:

TN3159: Migrating Sign in with Apple users for an app transfer

https://developer.apple.com/documentation/technotes/tn3159-migrating-sign-in-with-apple-users-for-an-app-transfer

If you are unable to resolve the issue after completing the user migration, please follow the steps outlined in the post below to submit a report via Feedback Assistant:

Gathering required information for troubleshooting Private Email Relay with Sign in with Apple https://developer.apple.com/forums/thread/794191

Once submitted, please reply here with the Feedback ID so I can begin my investigation.

Cheers,

Paris X Pinkney |  WWDR | DTS Engineer

Replies  1
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Participants  2
DTS Engineer OP
Apple
16h
Recommended

Hi @lfcj,

There are two common reasons for this issue to occur after an app transfer:

  • the app was the only app from the transferring team to use the Private Email Relay Service, which prevents communication to those users
  • the users were not migrated to the recipient account after app transfer

To resolve the latter, please see the following technote:

TN3159: Migrating Sign in with Apple users for an app transfer

https://developer.apple.com/documentation/technotes/tn3159-migrating-sign-in-with-apple-users-for-an-app-transfer

If you are unable to resolve the issue after completing the user migration, please follow the steps outlined in the post below to submit a report via Feedback Assistant:

Gathering required information for troubleshooting Private Email Relay with Sign in with Apple https://developer.apple.com/forums/thread/794191

Once submitted, please reply here with the Feedback ID so I can begin my investigation.

Cheers,

Paris X Pinkney |  WWDR | DTS Engineer

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