What nmh needs is some generic tools that can be used to fetch mail via:
1) Local delivery from the MTA
2) Fetch mail from the local maildrop
3) Fetch mail from POP, IMAP and all the other methods supported by
fetchmail
4) Accept mail from a third party program (i.e. be an mda for fetchmail)
I think this is all great; we just need someone to write the code :-/
To me this means that the mail fetching function should be separated from
the filtering/storing function. The filtering/storing function could be
used as a backend to inc, or called from the MTA's delivery agent, or from
fetchmail running in the background.
Inc could be made more modular and invoke a function to fetch mail (from
the local maildrop, or invoking another program, such as fetchmail), then
run the filtering function. We could at that point decide to stop directly
supporting flavors of POP and rely on an external program such as fetchmail.
I've looked at the Sieve libraries; there are a couple of good candidates.
Other embedded languages are options, of course; I only mention Sieve since
it was explicitly designed for email filtering.
--Ken
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