It is not necessarily the rejection of the other party. The reason for your refusal is that rcpt deals with English overtime. This question should be the return information of the sender's mail server. The possible reason is that the mail server thinks your mail is illegal (for example, it thinks you are sending spam).

I don't know what you wrote in the body of the email. Maybe your email just meets the spam filtering rules set by the other party's mailbox. It may also be because of attachment. I suggest you don't add attachments, and try to put your resume directly in the text.