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+folder (default: current folder)
Folder name
-header (default)
Print folder name and message number before displaying message
-noheader
Don't print heading
-showproc program
Program to display message with
-noshowproc
Display message with cat
-checkmime (default) (nmh only)
If message is MIME, invoke showmimeproc
-nocheckmime (nmh only)
Don't check for MIME
switches for showproc
Other command-line switches for showproc