Email courier is an individual who gets out of their chair and approaches someone's desk or workstation in a work environment almost immediately after sending them an email, usually to make sure that the email has been received and that they can get a reply right away.

Email courier指在办公室里刚给别人发完邮件就立马起身来到收件人的工作台旁边，跟人家确认邮件是否收到，还希望人家立即给回复的人，即“电邮快递员”。