From
https://lwn.net/Articles/416901/Officially, the last stable procmail release was version 3.22, made in September of 2001. As one might expect, there has never been an official "the project is dead" announcement. Instead, only circumstantial evidence exists. Although several of the FTP mirrors include what appear to be development "snapshot" packages as recent as November of 2001, there does not appear to have been any substantial work since that time. The developers' mailing list has hardly seen a non-spam blip since 2003.
Executive summary: delete the procmail port; the code is not safe and
should not be used as a basis for any further work.
From me:
This is for use at work by me, on our Solaris servers. Procmail is not provided by Oracle, or at least not in the standard install. I was wondering: If I'm going to go to the trouble to locate and install something (i.e. no default is available) should I go with procmail or something else? Maildrop looks reasonable. If I can get OpenCSW working, I'll see what's available there.
Kevin