The filters tab is added by a plugin - or extra function - that your provider has installed into Roundcube. There are a few different plugins which can add such a function so I can't say for sure which one you have but generally the idea is to allow end users to configure message files like "if the message is from x then put it into folder y".
Spam filtering is a different thing to message filtering, and the filters in the tab will likely only control what happens to messages which make it through the spam filtering and to your inbox and you'll see a rule like "if its marked as spam then put it into my quarantine folder". If could be that from your webmail there is no way to disable all the spam filtering (certainly there is no such function in standard Roundcube but your provider might have other plugins).
Since all email system are setup differently all we can do on this forum is direct end users like yourself to contact their provider since the provider is the one who controls the system and knows the setup and what the options are.
Thanks for your very clear reply.
However, this is extremely disappointing. Once again, I have no control whatsoever over my email, and am subject to the whims of this miserable Nanny-state oversight. The "tweaking" filter you describe is of no use to me, as (1) No filter works very well at sorting (maybe in another hundred years the AI will be up to the task), and (2) The more folders email is spread around in, the more work I have to do to check it.
Great. Who thinks this stuff up?
As for contacting my provider, the last time I did that, they blocked my phone number. They don't want any contact with users... too busy! There's a person to whom I send a check, but they have no more clout with the techs than I do. They're just bookkeepers.
That is disapointing to hear, if you are not happy with the service then may be you should consider changing providers.
There's not much else available in my area that's affordable. And I can't even contact the guy who collects the checks and does his best to handle support. The techs - as they've done at least twice before, since I've been on this system - waited until he left on vacation to make this major change. (Problems with my ISP's email were why I added a Gmail account, but a few days ago that started having unresolved problems of its own. Nothing works.)
My average daily email these days is down to 10-15 pieces - if nothing else, I can always count on a daily Amazon ad, eBay watch list reports, et cetera. In the three days since the switch to Roundcube, I've received ONE email!!!
The system works, insofar as I can send test emails to myself from within the system and from Gmail, so I have to assume that my Overlords consider email from any source EXCEPT myself to be a security threat. (Kinda like Chrome now considering
www.google.com to be too risky to allow me to view.)
I'm sick of this crap. Twenty years ago, the Internet was a fun place to be. I knew the guys who operated my ISP, and they were great. Now it's run by jackasses. I guess this is a generational thing.