However, his point about the program's slightly risky, monolithicdesign is well taken, and cautious sites may wish to adopt Postfix (which is open source licensed) or Qmail (which has an almost open source license) (see Resources).
ViaSat also offers design capabilities and a number of complementary products including monolithic microwave integrated circuits and modules, DVB-S2 satellite communication components, video data link systems, data acceleration and compression, and mobile satellite antenna systems.