SMTP Service Issue with Notification Center

English
1

I’m having a hard time tracking down what could be causing the email notifications to fail with the following error:

Warning 2026-07-30 17:32:06 — — localhost — Notification Center Service Account and Device Pairing [Notification Center] Failed to send a test message using SMTP Service.

I removed all my previous email server settings.
I added Google and autheticated. It fails
I added a local Mailrise docker SMTP server on the host machine. It fails.

Anyone know what’s going on and how I can track this problem down?

TS-453Be / QTS 5.2.9.3499

2

Is the Docker SMTP server getting any connection attempt from Notification Center? What do its logs say?

3

Nothing is being logged.