what is a letter of administration or testamentary
Letters of Administration Letters of Administration are granted by a Surrogate Court or probate registry to appoint appropriate people to deal with a deceased person's estate where property will pass under Intestacy Rules or where there are no executors living (and willing and able to act) having been validly appointed under the deceased's will. Traditionally, letters of administration granted to a representative of a testate estate are called "letters of administration with the will annexed" or "letters of administration cum testamento annexo" or "c.t.a.".
Letter of resignation Such a letter will often take legal effect to terminate an appointment or employment, as notice under the relevant terms of the position; many appointments and contractual employments are terminable by unilateral notice, or advance notice of a specified period of time, with or without further conditions. Even where an oral notice would be effective, the effective date or time of termination may be directly or indirectly fixed on delivery of a written letter or email, for the sake of clarity and record. In response, different arrangements may be made or agreed, such as an earlier effective date, or improved terms and conditions of appointment upon withdrawal of the letter.