Looking on the internet deeply has found these results:

if and when i receive information, i will let you know. is the most popular phrase on the web.

if and when i received information, i will let you know. 1203,000,000 results on the web	if and when i receive information, i will let you know. 1228,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Next time, I will let you choose the poses you want. If I find anything more, I will let you know. If we get out of here alive and we make it to our destination, I will let you go. Now, as soon as I can figure out a way to move her off the investigation, I will let you know. I will let you know if and when we need more guns. So, I will let you out of our agreement. Yes, I will let you in this time. Dickie, I swear, your actions jeopardize my plans in any way, I will let you swing for it.	I shall communicate the response to Members interested in the issue if and when I receive a reply. So, I will let you out of our agreement. Next time, I will let you choose the poses you want. When I receive information, it's masked by an encryption code. Yes, I will let you in this time. I will let you know if and when we need more guns. Dickie, I swear, your actions jeopardize my plans in any way, I will let you swing for it. When I receive information, it's masked by an encryption code.

if and when i received information, i will let you know.

1203,000,000 results on the web

if and when i receive information, i will let you know.

1228,000,000 results on the web

More popular!

Next time, I will let you choose the poses you want.
If I find anything more, I will let you know.
If we get out of here alive and we make it to our destination, I will let you go.
Now, as soon as I can figure out a way to move her off the investigation, I will let you know.
I will let you know if and when we need more guns.
So, I will let you out of our agreement.
Yes, I will let you in this time.
Dickie, I swear, your actions jeopardize my plans in any way, I will let you swing for it.

I shall communicate the response to Members interested in the issue if and when I receive a reply.
So, I will let you out of our agreement.
Next time, I will let you choose the poses you want.
When I receive information, it's masked by an encryption code.
Yes, I will let you in this time.
I will let you know if and when we need more guns.
Dickie, I swear, your actions jeopardize my plans in any way, I will let you swing for it.
When I receive information, it's masked by an encryption code.