Is there a way to send invoices via email in bulk AFTER creation? We have a list of invoices that we need to resend. I tried to look at Documents > Mail Merge > Bulk Merge but it seems that it's applicable only to attaching the customer statements but not the invoices.

You could create a custom checkbox called “resend email”. Then make a workflow that sends an email when that box is checked. Or a scheduled WF to send out all invoices with that box checked once per day Then you could update your checkbox easily via inline edit or even csv import

That's a great idea! Thank you!