Re: [Evolution] How do you retroactively train Bogofilter's spam / ham filters on multiple computers using existing messages (on an IMAP account)?

[Milan Crha via evolution-list]

On Thu, 2022-10-13 at 15:38 -0400, Jeff via evolution-list wrote:
> I went to my laptop to do the same, and there... it doesn't let me do
> that at all (those actions are grayed out, even though Bogofilter is
> installed and enabled there), presumably because Evolution marked
> them on the server with some sort of IMAP flag I would guess?

Hi,
you are right, the use case with multiple clients is "a problem".
According to a code comment, there is no indication that the message
had been marked as not-junk, which might confuse the users, maybe. The
idea is that you do not need to pass the same message multiple times to
the spam filtering software.

A "workaround" can be to add a message which was not mark as junk nor
not-junk yet into the folder and then select all the messages, which
will enable both of the actions.

As you mentioned, copying the bogofilter database can be done too, only
make sure you use the same bogofilter version on both machines, to
avoid problems in case the two versions would expect different database
format.

Bye,
Milan

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[Evolution] How do you retroactively train Bogofilter's spam / ham filters on multiple computers using existing messages (on an IMAP account)?

[Jeff via evolution-list]

Hi folks,

After years and years of not being known to spammers, one of my IMAP
email addresses got found, and I'm now slowly starting to get spam on
it. That IMAP account does not have server-side spam filtering (because
that's a PITA to try to figure out with my host) and I thought I'd
simply use Evolution's antispam features.

I read through many email threads from years prior in this mailing list
regarding spam filters, and it seems like the usual recommendation (by
POC & Ralf :) is to go with Bogofilter, i.e. that SpamAssassin is more
for (high-traffic) servers and Bogofilter is better-suited for mail
clients as a fine-tuned purely statistical approach to filtering. So
alright, I installed evolution-bogofilter and turned it on.

Then I thought I'd be clever and select my many years' worth of ham
messages and Right-click, "Mark as NOT Junk", and select the few spam
messages I already had filed in my server-side IMAP "spam" folder,
right-click, "Mark as Junk", in order to get super accurate filtering
from the start by leveraging existing data.

This seems to be working for my desktop computer I'm doing this on now,
as the Evolution statusbar gave me progress indications on "Learning
new ham messages in [the account and folder name] [percentage
complete]" while I was doing that. Cool.

Now here's the twist. I went to my laptop to do the same, and there...
it doesn't let me do that at all (those actions are grayed out, even
though Bogofilter is installed and enabled there), presumably because
Evolution marked them on the server with some sort of IMAP flag I would
guess?

If so, is there any smart way to retroactively train Evolution's
bogofilter on what is and isn't spam on multiple computers on an IMAP
account? Essentially, I want a way to right-click (or anything else in
the UI) and "force train as spam/ham" depending on the folders I
select; currently it seems like the Evolution UI forbids me from doing
that (by disabling the actions, whether in the menus, keyboard
shortcuts, or buttons). Am I missing something, or is this ability
simply missing, and if so should I file a ticket about it?

Otherwise, in the meantime (or alternatively), is it a smart move to
use Unison to propagate the ~/.bogofilter/wordlist.db (presuming that's
the one and only file that governs the filter) from my desktop computer
to my other computers when I need to?
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