You know that sending your transactional email through Postmark is the best way to improve your delivery rates, but sometimes even with the best tools and intentions, emails can end up in spam. To troubleshoot why an email is going to a spam filter in Gmail, you can click on the email itself and look below the sender and recipient information for more information about why Google thinks that email is spam. This includes examples of known spam patterns, such as messages from specific domains or content used in spam messages. It's also a good idea to periodically receive copies of your transactional emails and monitor changes to detect any issues. If you're ever stumped, Postmark's expert support team is available to help diagnose the problem.