You implemented all the authentication to whitelist your domain, yet campaigns still end up in spam folders. This can happen for several reasons, including the sending email address, subject line, or message content.
Even legitimate and innocent campaigns get trapped in spam filters based on small issues, like your sending name or email address, or information shared from other spam filters. We can't tell you if your campaign ended up in junk folders. However, your reports page contains helpful information that can help you improve your campaign deliverability.