CiviMail should consider successful deliveries and bounce count to put emails on hold

our current algorithm for placing an email on hold is very basic –
check for # of past bounces. if > threshold, place on hold.

we had an instance detailed in that ticket where the bounce was the result of periodic connection errors (not at our end – sendgrid couldn't deliver it, so it was legit). but in between bounce #2 and bounce #3 where 30+ successful deliveries.

what we should do is reset the bounce count if 1-2 successful deliveries are made, rather than tally the total bounces with no regard for successful deliveries.