We have a question about using our CiviMail configuration for emailing Event participants. We recently had an event with > 60 participants. When we went to send a follow-up email, we went to the event, selected all the registered participants, and then selected "Email - send now" under Actions. We used one of the standard CiviMail templates, but it apparently used our mail.php backup that we have configured instead of sending it through our Sparkpost extension. Because of that, we weren't allowed to send to more than 50 participants, so the mailing had to be broken into two parts. Additionally, in the resultant emails, not all CiviMail tokens were resolved.
Obviously, we could have put the people in a temporary group and then used the CiviMail interface that we've been using for months to send large bulk emails through Sparkpost.
Is there a way to configure the event "Email - send now" to work like Civimail? Do we always need to create a temp group when we have many participants? Additionally, I presume we are not getting bounce reports as we normally do via the Sparkpost webhook.