Weird issue from hotmail and office 365 mails

I noted that mails from and office 365 are being recieved randomly late between 5minutes - couple hours.
Is there any issue from hotmail side? Mail from yandex, gmail or some other servers are fine.

I found the issue. I was setting mail dns record as CNAME record. After changing it to A record from Cloudflare. Mail are coming fast. Very interesting.

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