I use the "Mail" connector in a LOT of my flows. Pretty much any time I want to have a flow send an email without it being attributed to an individual or use the end-user's Outlook mailbox, that's what I choose. Recently, I created a flow that took form responses, formatted each submission and emailed (using the Mail connector) the submitter a summary in PDF format. I didn't know when creating this flow just how many people would be filling out the form over the course of a couple days.
Basically, there were a handful of flow runs that were sort of "hung" at the send email action with a status of 429 (see below), which (I think?) indicates that the limit of connections for that action has been exceeded. Looking at the documentation (https://docs.microsoft.com/en-us/connectors/sendmail/), there is an "API calls per connection" limit of 100 calls in 24 hours. What I'm trying to understand is the scope of that. For example, does that mean that this particular flow can only send 100 emails via that connector in a 24 hour period? Or, does it mean that all of the flows that I've built using that connector (which is a lot) have a combined/cumulative limit of 100 emails per 24 hours? As a workaround, I've had a shared mailbox created that I can use (in some cases) with the Outlook connector's "Send from a shared mailbox" action in place of the "Mail" connector's "Send an email" action. However, many of the flows I build are triggered from PowerApps, so they run as the user running the App, and I can't give "everyone" send as permission for that shared mailbox.
