Special thanks to:

Eric Allman	The core of the material here comes from his FAQ for version 8.6.9 sendmail. I couldn't even have gotten started were it not for him. And if he hadn't written sendmail, there obviously wouldn't even be a FAQ. Heck, there might not even be an Internet.
Paul Southworth	Provides FAQ posting services, useful comments on various sections, and the mailclient-faq. I couldn't have kept doing this were it not for his help.
Ed Ravin	Virtually all the material regarding the use of sendmail on AIX is his, and most of it has been carried over verbatim.

Thanks also to:

Neil Hoggarth, Andras Salamon, Johan Svensson, Christopher X. Candreva, Bill Wohler, Matthew Wall, Henry W. Farkas, Claus Assmann, Curt Sampson, Rebecca Lasher, Jim Davis, David Keegel, Betty Lee, Alain Durand, Walter Schweizer, Christophe Wolfhugel, Al Gilman, Valdis Kletnieks, John Gardiner Myers, Paul DuBois, Adam Bentley, Dave Sill, Dave Wreski, Paul Caloca, Eamonn Coleman, Michael Fuhr, Betty Lee, Derrell Lipman, Era Eriksson, Richard Troxel, and the readers and posters of comp.mail.sendmail.