I updated to 4.6.27, and recurring donations started re-sending out email receipts each month. The old behaviour was to send an email receipt when they made their contribution but not a monthly email. I'm using the Stripe payment processor.
We do not use Stripe so this might not help. But this is how it works for iATS.
Go to Administer > CiviContribute > iATS Payments Settings (the very bottom option) One of the check boxes is "Enable email receipting for each recurring contribution" If this is checked you will be sending a receipt with each donation.