Hello, send an email to the mailbox of an American university for consultation.

What are you consulting? School content? If most student mailboxes are equipped with anti-spam function, many emails will be automatically filtered out. If it's the admissions office, well, many times you don't get a reply. You can try, but because these admissions offices receive countless email attacks every year, there are quite a few cases where they can't get a reply even if they write a consultation.