Turning *OFF* POP3 polling requires a valid username/password for the POP3 service

Bug
1

Severity: Minor annoyance.

Platform: Any

Description:
I have had POP3 polling from outlook.com, but that does not seem to work anymore without Oauth. It fails with unknown username and password. We don’t need POP3 polling anymore, so I want to turn if off. When I turn off the setting and saves, I get an error:

The image shows a screen with an option to enable POP3 polling for email replies, indicating successful activation and an authentication error. (Captioned by AI)
The image shows a screen with an option to enable POP3 polling for email replies, indicating successful activation and an authentication error. (Captioned by AI)795×161 7.08 KB

Actual result: Error message as in the image, the setting was not saved.

Expected result: The setting to be saved and POP3 polling to stop.

Reproduce:

  1. Set up an POP3 account using a username and password
  2. Configure Discourse to use this account
  3. Verify that polling works.
  4. Change the password for the POP3 account on the service (don’t change it in Discourse, I assume it will be tested before being allowed to be saved)
  5. Turn off POP3 polling in Discourse.

I am on Discourse version 3.5.0.beta2-dev (44aa0eda27)

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