Your emails are not getting delivered and landing in the spam folder, which can be a serious problem, especially if it's part of the sign-up process. This happens because several variables can affect the result of sending an email, including poor domain reputation, high bounce rates, spikes in sending volume, lack of engagement, and using spam words or all caps. To improve your deliverability, you need to show providers that you're trustworthy by warming up your domain, setting up proper authentication records such as SPF, DKIM, and DMARC, and using a reputable email service provider like Google Workspace or Office 365. When writing content, follow industry best practices, test emails before sending them, and avoid spam triggers such as tracking pixels, URL shorteners, and aggressive punctuation. Additionally, validate your email list, use double opt-in, stay out of blacklists, and ensure you're not sending to people who don't want to receive your emails. By identifying the root cause of the problem and taking the proper action to fix it, you can improve your chances of landing in the inbox.