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, 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.