In what way will the original patent application, acceptance notice or rejection document be sent to me by mail, courier or envelope?

All documents issued by the Intellectual Property Office are sent by post office, unless otherwise specified, they are generally delivered to the parties by registered mail.

If it is determined that the document cannot be mailed again due to unclear delivery address or other reasons, it will be announced in the patent bulletin to inform the relevant parties. One month after the date of announcement, the document shall be deemed to have been delivered.