You could also use acknowledge, which is more commonly used in the context of somebody receiving a mail and saying he has got it.
Please and kindly mean the same thing and one of them is enough.
Also, if you have said "receipt" in the sentence, there is no need to follow it up with "after you have received it", which means "receipt".
It is sufficient to say:
Please acknowledge receipt of this email and attached documents.
Or, if you want to use confirm:
Please confirm that you have received this email and attachments.