Enabling mailing to programs on SGI/IRIX

What has to be done in IRIX to enable mailing to programs?  When I
mail to myself on the SGI, I get "User dkarr does not have a valid
shell for mailing to programs".

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David M. Karr        | Unix/X/C++/Emacs  |          GTE - Government Systems
dkarr(_at_)nmo(_dot_)gtegsc(_dot_)com | Software Engineer | w:(206)487-8578   
h:(206)844-3896
dkarr(_at_)eskimo(_dot_)com     |                   |