A singulator device for standard postal objects and extended postal objects configured for receiving at input groups of standard/extended plane rectangular postal objects grouped in packs and supplying at output singulated standard/extended postal objects, i.e., each one physically separated from the others, the device comprising: - a singulator system; - a resting surface (12,13) for the packs of postal objects; - a drawing system that displaces the packs towards said singulator system designed to withdraw individually the postal objects that form a front end face of the pack; the postal objects forming the front face of the pack abut against a gripping portion that moves the objects in a direction transverse to that of advance, separating them from the pack, said device comprising supporting means configured for providing abutments on opposite top end portions of the packs comprising extended postal objects to keep the extended postal objects with planes which lie substantially perpendicular to the direction of advance, preventing the extended postal objects from possibly bending towards the adjacent packs formed by standard postal objects wherein the supporting means comprise a plurality of supporting units, each of which is designed to couple with a respective pack of extended postal objects, characterized in that said supporting unit comprises a first abut element (31a - front) and a second, abut element (31p -rear), the distance between which, in the direction of advance, can be adjusted in order to arrange the abut elements against a top portion of a front face and, respectively, a rear face of the pack of extended postal objects; both of the abut elements (31a, 31p) move in the direction under the thrust of an actuator with a motion synchronized with the motion of the drawing system for accompanying the pack of extended postal objects and preventing, thanks to the abut ensured by the abut elements themselves, the extended postal objects from possibly bending towards the packs of standard postal objects; wherein said abut elements (31a, 31 p) are able to slide along a rectilinear guide parallel to the direction of advance; each abut element (31a, 31p) comprises a shaped wall; in particular an L-shaped wall, having an end portion connected to an element that is able to slide along said guide; the distance between the abut elements (31a, 31p) being settable by manually modifying the mutual position of the elements along the rectilinear guide; and wherein a return guide is provided parallel to said guide, said guide provides a forward guide for the front/rear abut elements (31a, 31p) towards the singulator system; said return guide being associated to a second actuator that provides a motion of recession of the front/rear abut elements (31a, 31 p) from the singulator system; first exchange means are provided, configured for transferring at least one abut element that has reached a front end portion of the forward guide to a corresponding front portion of the return guide, and second exchange means configured for transferring at least one abut element that has reached a rear end portion of the return guide to a corresponding rear portion of the forward guide. - a singulator system; - a resting surface (12,13) for the packs of postal objects; - a drawing system that displaces the packs towards said singulator system designed to withdraw individually the postal objects that form a front end face of the pack; the postal objects forming the front face of the pack abut against a gripping portion that moves the objects in a direction transverse to that of advance, separating them from the pack,