It’s one of the most common questions I’m asked about online fundraising. Should we rent an email list? The question usually comes when a big moment happens for your campaign and you want to make the most of your opportunity.

Every voter you’re trying to reach online day in and day out is also being targeted by companies, organizations, and influencers for their attention. That means your opponents also include Target, Kylie Jenner, and Game of Thrones.

Email is still the king when it comes to online fundraising. Here are six emails that are proven ways to convert supporters into donors.