My list of mailing lists is getting so large that I now have a class of mboxes that are more archive and reference than something I'm actively interested in.
Here's an update for those following my newmail.cc mailbox reporter program.
I added the capability of listing archive mboxes in your .newmailrc with a value of -2. Then you can selectively hide/show this second-tier list of mboxes with the -H and -S switches.
I also added an environmental getopt() that behaves the same way as getopt(), but prepends the command line options from an environment variable ahead of the argv options.
env_getopt() seemed like something that somebody would have implemented before, but I didn't see anything like it in my web search. I may have reinvented the wheel. Anyway, it is now implemented as GPLv2 in case others need the same functionality.