Can I send a notice of breach of contract by SF Express?

Of course. Notice of breach of contract is an important legal document, which usually needs to be sent by express mail to ensure that the document can be delivered accurately and timely. SF Express is a professional courier company, which can provide fast, accurate and safe mailing service. So if you need to send a default notice, you can choose to use SF Express. Of course, in order to avoid disputes in the mailing process, it is recommended to properly keep relevant supporting documents and mailing vouchers when mailing, in case of emergency.