A donation thank-you letter not only shows your good manners,     can help deepen your ties. Also, the other person will feel that     appreciate his or her contribution, however small it is.
When you are writing     donation thank-you letter, you should use the name of the donor instead of just using a basic greeting. You should thank the person sincerely for his or her support and explain     useful it proved to you. You need to tell the person the good things     their donation helped you achieve. You need to be specific as to when, how and on whom or for what the donation was used. The tone of the letter should be personal, as if you   speaking face to face to  the donor.
You should send the letter in 48 hours    receiving the donation. If you fail to do that, then it should be sent over within a week. The sooner you send it, the   .