microsoft is the same, one day our emails started to go directly to spam for office365 customers, the only effective thing that i could do is to move to mandril

microsoft is the same, one day our emails started to go directly to spam for office365 customers, the only effective thing that i could do is to move to mandrill. there is zero spam, and all our emails are b2b notifications so no spam, not even newsletters. sending emails (if you care about delivery) became very centralized