The ornamental design for a mailslotinput for transmittal device, as shown and described.
A mail envelope-shaped slot is provided on a transmittal device for inputting a paper copy of a document to be transmitted.
FIG. 1 is an isometric view of a mail slot input for transmittal device embodying my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a top view thereof.
The broken line showing of the mail slot input for transmittal device is included for the purpose of illustrating environmental structure and forms no part of the claimed design.