[Bug] I still receive letters from addresses marked as Spam

[tprudentova]

0.12.0, tested on Android, Safari, Firefox, Opera; mail.stg.lin-saas.com

1. Select a letter, mark it as Spam
2. Receive a letter from the sender of the letter marked as Spam
3. The letters still arrive to Inbox and not to Spam

Expectation: if I marked an address as Spam, the letters arrive to the Spam folder; I see the Spam banner

https://github.com/user-attachments/assets/7e231166-3b53-4641-bd84-2f150bf0f0b8