shǔmíng lǐ zhìshǎo fàng xìngmíng, zuì hǎo hái yǒu zhíwèi, bùmén huò liánxì fāngshì

署名里至少放姓名，最好还有职位、部门或联系方式。

In the signature, at least include your name; ideally also your position, department, or contact information.