Following are the steps to override Spam Filtering setting for particular email account:
- Login to your Webmail (i.e. mail.yourdomain.com).

- Go to Settings → My Settings → Filtering → Spam Filtering.
- Click on Override spam settings for this account.

- Go to Actions and set the action you want, below actions are available:
- No Action
- Delete Message
- Move to Junk email folder
- Add Text to Subject

- And finally click on Save to apply changes.