The phrase "a notification letting" is correct and usable in written English.
It can be used when referring to a notification that informs or allows someone to know about something.
Example: "I received a notification letting me know that my package has been shipped."
Alternatives: "a notification informing" or "a notification advising".
If B&T doesn't have the product, it sends Disinformation a notification letting Baddeley know when it can fill it.
Whenever there's a change in the SQL database, the dispatch nodes get a notification letting them know that there is new data to dispatch.
Instagram says that you'll receive a notification letting you know if you've been approved or rejected, so look out for that.
(You'll see a notification letting you know that the feature has been enabled once it goes live on your account. Scroll past it, and you're opted in).
The update had already installed for me when I woke up this morning, with a notification letting me know what was up, but required no intervention on my part and also ran without having to restart my Mac.
Then you must be approved) Placing an "@" symbol before a username will send that user a notification, letting them know a comment was directed towards them.
You can add or remove viewers both before and during a broadcast, and when a friend starts broadcasting you'll be sent a push notification letting you know there's something going on.
Starting a show was as easy as sending a message ; users picked a co-host (or hosts) and a title for the show and their friends received a push notification letting them know it was go time.
If someone is bored and curious about what their friend is up to, the application will send a push notification letting the recipient know her friend wants to start a live stream.
Likes and Re-vines are now separated by what's newer and what you've already seen, and when one of your Vines does exceedingly well, you'll receive a milestone push notification letting you know how awesome you are.
When it pops up the notification letting you know that there's a new message, there's a "View" button which will open Gmail in the iPhone's web browser.
