I finally got to try out the famed Inter7 for the optimisation of two of my qmail servers. I must say that they really live up to their fame.
What took us weeks was done in a couple of hours. Performances of the servers improved beyond our wildest imagination. Was extremely pleased with the results. Some of the problems that plagued us for years seem to just disappear with their magic touch.
Strongly recommended for their technical capability and professionalism.