Emails marked as bounce when quota is full
There are cases (usually when using Gmail SMTP) when the Outbound email fails to deliver a mailing due to the user's daily quota being exhausted. In this case, if the mailing is re-used unknowingly, attempts to re-send the mailing adds to the bounce threshold, finally surpassing the limit of three bounces, marking the email as "on hold". To solve this, I'm thinking bounce type of "Quota" should be excluded from the calculation of marking the email as on hold. Please let me know if this is reasonable and I will provide a patch.