You can turn off My Alerts email notifications or delete your alerts altogether. Here's how:
First, click on My Alerts in the menu when you are logged in to your account:
(what it looks like on desktop)
(what it looks like on mobile)
Then, click on the bin icon next to the alert you want to delete:
(on mobile, please remember to scroll right to see the above icons!)
Alternatively, you can keep the alerts and just switch off the notification:
This way, you can see the results of your alerts on this page when you come to the site, but it will not send you email alerts. Think of it as a personalized filter of the products on the site!