If you would like to confirm that you have received an employee resignation, here is a sample template you can use to write an acknowledgment letter after resignation.
To [Recipient name]
Dear, [Recipient name]
This is to acknowledge your resignation from the position of [Position title] in the [Department name] department, effective from [Date].
You will continue to reive your stipend until the date of your official resignation. Ensure that you return the property of [Name of company] to the office on or before the decided date of your employment such as credit cards, keys, laptop, and other items provided by the company.
We wish you luck for your future endeavors and appreciate your contribution to this company.
Thanking you again for your sincerity and hard work.
[Name of company]