frank theriault mused: > > Something's up (maybe not with PDML) somewhere...
One word - spam. The volume of junk email continues to increase, putting an ever-increasing load on the underlying transport system. Sometimes, somewhere, a weak link fails, and drops messages without reporting this failure to the originating system. Or, possibly, some misguided filtering software on a badly configured server throws away the occasional genuine delivery failure notification in an attempt to discard spam disguising itself in this way - a fairly common script-kiddy spam tactic.
