The maximum allowable spam complaints for any email marketing campaign. Since the deliverability of email messages sent through MNB is partially dependent on the reputation of its users, we have a complaint tolerance of 0.1% (1 complaint per 1000 emails). When complaint rates exceed 0.1% repeatedly, it can lower the deliverability of other users’ emails across our entire system. For this reason, we temporarily suspend accounts that exceed the acceptable spam report rate. You may be contacted by our Customer Service team to help you get your complaint rate to an appropriate level.