When i sent email with my postal smtp server to yahoo or hotmail… all mail goes to spam box… My postal smtp server scored 10 / 10… Why this is happening… How to send inbox… Anyone plz help…
You need to warmup your server. Inboxing depends in many factor.
Read this guide to warmup your server
https://inguide.in/secret-of-ip-warming-plans-schedule-strategy-pitfalls/