How To Write A Grateful Resignation Letter . Make sure you have it all complete from the date, greetings, salutation, and signature part. The best resignation letters are: Grateful Resignation Letter With Regret sample Templates at from www.allbusinesstemplates.com You can follow these steps to write a resignation thank you letter: As you know, i was employed on permanent and pensionable terms. My last day at stonewall & co.