Abstract: A mailer structure designed to accommodate sending, through postal services, a first class letter and through components associated with the subject mailer structure, the return of a domestic return receipt in accordance with postal requirements for certified letters, return receipt requested. The subject mailer structure includes a base sheet having a first and second portions removably connected to one another by a seam preferably defined by a perforated construction to allow separation of the first and second portions. The second portion is dimensionally larger than the first portion and includes a front surface and rear surface having zones formed thereon for the individual printing or writing of a personalized message, the identification of the article being sent, and space for the address of the addressee. The rear surface may include a pre-printed standardized or generalized message thereon.