1. A method for use in managing delivery of content over a network, comprising: receiving a message, wherein the message includes an image file; extracting the image file from the message; forwarding the message with the image file towards a destination for display based on whether at least one physical characteristic of the image file indicates that the image file is unlikely to be image spam, wherein at least one physical characteristic includes at least one of a file type, file size, or file dimension, otherwise: performing pixel edge detection within the extracted image that includes at least eliminating weak edges by converting a pixel to black if its threshold chrominance is below a defined threshold; determining a normalized pixel density distribution (PDD) for the edge detected image; performing a multi-dimensional statistical analysis on the normalized PDD to determine whether the image file is likely to be an image spam file based on a PDD threshold; if the analysis indicates that the image file is likely to be an image spam file, performing an action to inhibit at least the image file from being forwarded to a destination associated with the message; else if the analysis indicates that the image file is not image spam, forwarding the message with the image file towards a destination such that the image file is viewable by a recipient at a display; collecting feedback based, in part, on a number of false-positives for the indications from the statistical analysis; and employing the feedback to modify the PDD threshold.