The code answering to your questions is mostly here https://github.com/dyne/JaroMail/tree/master/src/zlibs and here https://github.com/dyne/JaroMail/tree/master/src

The short answer is: makes it quick (make && make install) to setup all the mutt/fetchmail/abook/notmuch integrated yadayada plus adds whitelisting and folder filtering, both local and remote via sieve.

This helps a lot, thanks. It looks like maybe Jaro makes it easier to configure that Mutt (which is a very complex configuration), is that true?

yes... all you have to configure to be set is a file like this https://github.com/dyne/JaroMail/blob/master/doc/Accounts/de...

there can be one for each different account inside Mail/Accounts.

I think Mutt is really great software, but I cannot live without tab completion from my addressbook and I need it without spending 1h to configure it every time, so that's the gist of it...

What do you use for your address book? I just use mutt's alias so have tab-completion out of the box.

Given the reference to notmuch, I'm guessing harvesting addresses from/with notmuch index?

I know that "me too" comments are frowned upon in HN, but I think in this context it would be useful for the author to know that at least one other person in addition to Touche also found the page very difficult to understand (and I am familiar with Mutt, Fetchmail, etc.)

You are both right. I've spent most time documenting this software into its manual, which is a PDF http://files.dyne.org/jaromail/jaromail-manual.pdf

And srsly I did not expected it to be #11 on HN all of a sudden. This is all so niche...

I actually did read some of the manual (which I appreciate the detail it has) but that didn't help my confusion because it seems to mostly overlap with Mutt, which would make sense if it was a Mutt competitor but it uses Mutt. As a small example, why is there a `jaro compose` command when you would normally just press `m` in Mutt?

I don't follow how you expect people to use Jaro. It seems like you use email as something that you pop in and take a look at every now and then, is that correct? It makes sense with all of the commands you support; why would I use `jaro fetch` if I already have Mutt open and it automatically fetches new mails. So am I wrong in saying that leaving Mutt open all of the time is not how you do email?

forgot to mention it also seamlessly integrates mixmaster, so that you can just ESC-f and set `From: anonymous` directly in mutt before sending. Then `jaro send` will will weed headers and route it via the mixmaster running. Sort of handy.