Since the company has left a special mailbox, that means you can send your resume to it. The company left a phone number, which means you can call them.

Just one copy, don't repeat delivery;

Many corporate mailboxes filter attachments, so it's best to paste your resume directly in the email. To be on the safe side, put your resume in the body and attachment of the email, and remember that the content must be consistent;

You'd better give your mailbox an eye-catching name. The name depends on the recruitment requirements of the enterprise. In short, write your brightest words, such as "three years of human resources experience in foreign companies" and "successful experience in large projects"

Finally, be sure to write the position you are applying for in the subject of the email.

These are all the criteria for me to see job seekers email me. Those who do not meet the above conditions are generally not seen. I have to say that there are too many resumes.