Login to your account and proceed to the 'Saved Filters' from within the Labs menu.
The page will lead you to any filter preferences you've saved in the past. There are 2 ways you can stop receiving email notifications for "New product ideas".
1. To stop all emails, set the email frequency in the top right corner to 'Dont email me'. This will keep your saved filters unchanged, however will prevent you from receiving "New product idea" emails.
2. To stop on certain saved filters sending you emails, click X button on the far right of each specific saved filter. Please note, this will also remove this saved filter.
Short URL to this FAQ: https://www.salehoo.com/u/MJtJ2