Emails we sent marked as SPAM mostly

[Kuddusi DEMİR]

In our company,

We have just to migrate Microsoft 365 Business Standart plan. 

Planning a meeting in Microsoft Teams. Most users outside of our Company says that the emailed marked as spam.

All DNS settings managed by Microsoft side. All seem green. Attached.

How can we solve this issue?

[#2]

Best thing to do is ask one of said users to send you the full message headers, which you should then run through the message header analyzer tool or similar to determine what the cause might be.

[#3]

Hi @Vasil Michev ,

Thanks for your reply.

I don't prefer to share whole header from here. I send a message to you. Thanks in advance.