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?
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