Your BombBomb account might go on hold for a variety of reasons. Usually, the Deliverability team of BombBomb will put your account on hold due to damaging statistics from your sends in the recent past. During the time your account is on hold, the team will figure out what happened.
The team will work with you to ensure that the same issue doesn’t arise again. High bounce rates or too much spam can be the primary reasons. You need to keep these numbers on the lower side to maintain your reputation.