現代辦公室，大家基本都用郵件或者即時通訊工具來溝通工作，鍵盤上說不清楚的，才面對面溝通?？墒牵羞@么一類人，他們會先給你發郵件，然后立馬跑到你桌邊催你查郵件，并且要你立即給個回復。

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指在辦公室里剛給別人發完郵件就立馬起身來到收件人的工作臺旁邊，跟人家確認郵件是否收到，還希望人家立即給回復的人，即“電郵快遞員”。

For example:

Bill: I just sent you an email. Did you get it?
Bill: 我剛給你發了封郵件，你收到了嗎？

Mike: Probably, I haven't checked.
Mike: 可能收到了吧，我沒查郵箱。

Bill: Can you check?
Bill: 你能查一下嗎？

Mike: Uh yeah, looks like I got it.
Mike: 呃，對，收到了。

Bill: Thoughts?
Bill: 你什么想法？

Mike: My immediate thoughts are you're an email courier and a douchebag.
Mike: 我現在的想法是，你是個電郵快遞員，而且是個討厭鬼。