Add settings for "Not delivering to previously bounced address" error
A few days ago one of our users got into suppression list because Google (for some unknown reason) hard bounced his CORRECT email. We have doublechecked it and it works alright. Each time Mailgun received hard bounce, it adds the bounced email into suppression list. But sometimes innocent users are getting there too.
So, please add a feature/setting "Hard bounce attempts required to move email into the suppression list", with increasing cooldown, starting from 600 seconds, or something similar. So if it's a wrong email, it will be hardbounced three times and suppressed; it is a result of some bug in Google - it will be saved.