The article is devoted to the specifics of the genre of epistles in the poetic work of A. Vavilov. The features of the subject and compositional structure of the poems "Letter", "Letter from the Fleet", "Letter from Barack Obama", "Letter from the city of demons", "Letter to Odin", as well as the originality of the communicative situation realized in the poet's artistic world. As a result of the analysis, it was concluded that the epistle is a variant of the role lyrics of A. Vavilov, and the boundaries of the genre in its individual author's embodiment are mobile.