Hello,
The Order Flow email notifications have had a few nice improvements in the last couple years. However, there is one remaining issue. That's that it doesn't remove duplicates when sending. If you have Billing and Shipping (and possibly others) selected, and the same email address is used more than once, it sends multiple emails to that user. That's unlike the Shopping Cart module that does seem to de-duplicate the email address.
Would it be possible to check for the same email address and only send once?
I realize that there are possibly 2 email templates (to support the 'Send to others') so it's acceptable to consider them separately. The key thing is that if the same email is in the billing and shipping and/or the custom field that it only sends them one email.
Thanks,
Scott