Warmbox

Warmbox is a tool designed to improve email deliverability for cold email campaigns by automating a process called inbox warm-up. According to its official website, the product addresses the problem of emails landing in spam, citing that 51% of sent emails end up in the spam folder. The product is intended for users running cold emailing campaigns for sales or marketing purposes, who risk having their sender reputation damaged or their domain blacklisted without a warm-up process. Its key capabilities include connecting to any email service provider—such as Gmail, GSuite OAuth, Outlook 365, Yahoo Mail, Amazon SES, and SMTP—in approximately two minutes without requiring technical skills. Once connected, Warmbox automatically sends realistic emails from the user’s inbox, using GPT-4, and interacts with them as a human lead would. These interactions include removing emails from the spam folder, opening and bookmarking them, and replying to a portion of them. The system relies on a network of over 35,000 private inboxes, composed of various email service providers, to generate these positive interactions and raise the user’s email sending reputation.