A longer version of this article, complete with the details of the qmail configuration used, is available from the Linux Journal web site (www.linuxjournal/article/6299).
Dan Bernstein's qmail and tools: cr.yp.to
Dave Sill's “Life with qmail”: www.lifewithqmail.org
André Opperman's “The Big Qmail Picture”: www.nrg4u.com
Bushmail is a commercial provider based in South Africa offering a publicly accessible radio e-mail network to many locations in sub-Saharan Africa: www.bushmail.co.za
The Mission Aviation Fellowship provides additional information on the use of HF radio modems, particularly oriented to the use of the E-Smith Linux distribution: www.maflink.org
The International Rescue Committee: www.theirc.org