请尽快通过电子邮件确认收到我的申请。

Please ___acknowledge receipt of my application by email as soon as possible.

我们尚未收到确认收到我们正式投诉的电子邮件。

We have not yet received an email to ___acknowledge our official complaint.

法律要求该公司在三个工作日内正式确认收到法律文件。

The law requires the company to formally ___acknowledge the receipt of the legal documents within three business days.