When given the opportunity to win something for free by entering an email, people will take advantage of this opportunity as there is nothing to lose for them. However, as an email marketer, you are at risk of collecting emails that are either invalid or are not engaged with your brand. When sending to this list, there is a likelihood that you see lower than normal performance. To help minimize your bounce, spam, and unsubscribe rates, we recommend turning double opt-in on if it is not already. This will help you obtain a cleaner list through your giveaway promotion.
Along with using double opt-in, the first campaign sent to this new list should remind the recipient of how their email was collected in the first place. This would help mitigate the likelihood of recipients marking your email as spam.