以 … 的名义 (in the name of)

Signed with the company's stamp

• to use以yǐ + Subject + (of / 's)的dename名义míng yì = "in the name of / on behalf of".
• to use以yǐcompany公司gōng sī(of / 's)的dename名义míng yì发邮件fā yóu jiàn = "send an email in the company's name."
• to use以yǐ…name名义míng yì states the authority an action is done under.

to use以yǐ + Subject + (of / 's)的dename名义míng yì，…

• to use以yǐ…name名义míng yì names whose authority the action carries.

he他tāin以yǐcompany公司gōng sī的dename名义míng yìsign签qiān了lecontract合同hé tong。

• to use以yǐcompany公司gōng sī(of / 's)的dename名义míng yì签合同qiān hé tóng = "sign the contract in the company's name."

Recap

Read the full reference: HSK 6 grammar — Sentence patterns.