Email Notifications Stopped Sending

Hi,

I've had email notifications set up for a while now, but sometime last week, email notifications stopped being sent, despite everything on the email server side seemingly working. I checked the Immich logs using the Docker CLI, and found these suspicious errors:

immich_server | [Nest] 27 - 10/20/2025, 2:40:36 PM ERROR [Api:ErrorInterceptor~9scksig5] Unknown error: Error: Can't send mail - all recipients were rejected: 553 5.7.1 <Immich Photo Server noreply@example.com>: Sender address rejected: not owned by user noreply@example.com immich_server | [Nest] 27 - 10/20/2025, 2:45:01 PM ERROR [Api:ErrorInterceptor~mp0lqu2f] Unknown error: Error: Can't send mail - all recipients were rejected: 553 5.7.1 <Immich Photo Server noreply@example.com>: Sender address rejected: not owned by user noreply@example.com immich_server | [Nest] 27 - 10/20/2025, 2:45:10 PM ERROR [Api:ErrorInterceptor~jyc2gdut] Unknown error: Error: Can't send mail - all recipients were rejected: 553 5.7.1 <Immich Photo Server noreply@example.com>: Sender address rejected: not owned by user noreply@example.com

I went and checked if I accidentally revoked the SMTP credentials, and even manually sent a test email using a regular email client, but I can't get Immich to successfully send any kind of email.

What do the errors mean? Does the issue seem to be on the Immich end of things, or the SMTP server end?

Thank you.
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