I'm implementing trackbacks for the phpBB forum software. I used the MT Trackback specification, which specifically states that trackbacks are sent via POST. Trackbacks sent via GET are deprecated, and support for them was slated to end in January, 2003.

As I've documented here:
http://www.movabletype.org/support/index.p...ST&f=18&t=35170
current versions of both MT and the standalone MT Trackback tool do not adhere to the published Trackback specification. Specifically, if a trackback URL contains a "?", the trackback is sent via GET.

I'm reporting this as a bug, either in the MT trackback implementation or with the trackback specification document. Either MT currently violates the written spec, or the spec is out of date and ought to be updated.