Well, it works fine for every single recipient unless it's a Microsoft one. If the recipient is using a personal microsoft / outlook / hotmail account the emai

Well, it works fine for every single recipient unless it's a Microsoft one. If the recipient is using a personal microsoft / outlook / hotmail account the email gets delivered with a spam score of 9. If the recipient is a MS 365 account, blackhole it is. We even set up our own MS 365 to prove this.