Hi @Damir Akhoundov ,
Welcome our Q&A forum!
According to your description and NDR report, the problem seems to be that your recipient cannot receiving the email or email delayed, and there is nothing to do with you as the sender side.
It is recommended that you contact the recipient and ask them to submit service help case and seek help from MS, and I have searched in our IM and have not found similar cases so far, I will let you know if there is.
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