Same domain emails are bouncing back others are working fine

I have moved recently my website to a VPS everything working well except for the email.

Emails are delivering well on any domain other than the domain where website is hosted.
E.g. emails are sent to @gmail.com @yahoo.com or @anyotherdomain.com. But on domain www.mywebsite.com this is where website is hosted and if i send email like sale@mywebsite.com I got bounce back stating “Unknown user: sale”

Please help me in fixing this problem. I am thinking this could be MX record issue but I am not sure.

For email service I am using office 360.

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