Why do some emails go to spam?

Messages go to spam when something in your sending behavior triggers caution. This can be poor reputation, low engagement, inconsistent sending patterns, broken authentication, or risky contact lists.

Sometimes the content triggers rules, especially if it resembles phishing or bulk promotional mail without engagement history.

Spam placement is the mailbox provider saying your ship can enter the harbor but it must dock in the outer cove where few people wander.