Do I have to stamp the donation letter before sending it to the person?

Yes.

Where the security of funds is concerned, the correspondence and documents exchanged between people must be in the form of a company to hand over and pass on the company's official seal is a legal responsibility and professional attitude.

Difference between donation and gift According to the meaning of the composition of civil legal acts for the singular or plural, civil legal acts can be divided into unilateral civil legal acts and two or more civil legal acts.