Would it be possible to add a "One-Click" filter for emails that I wish to block permanently, instead of adding a rule to the Email filters?
I receive quite a number of "Phishing" and just plain annoying emails about stuff you don't even want to know about. I would LOVE a feature that would add these email addresses (domain names primarily) to a "Dump List", where the email would remain unopened, and the domain name would be placed in the "From" column in my email filters. Not fussy, just tired of creating a rule for each and every variation of these losers... "One-Click" and they are gone forever, added to my filter list (in case I need to allow them on specifics) - THAT would be heaven for me! Thanks! BTW, YOU GUYS ROCK!!
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They are junk mail. So I press the junk mail button on my toolbar and they are gone and over time the junk filter learns they are junk an I simply do not see them at all. If you don't have a junk icon on your toolbar, right click the toolbar and select customize and put one there.
While what you ask is technically possible it is not a good long term answer and there is reluctance to implement even an add-on for that reason.
Filtering is a very expensive process in terms of time and CPU usage. If we leave it to manually adding so you the user knows that each message you get goes through a look up process through however many hundreds or thousands or entries you have in the filter before displaying it. So one click and they are gone makes for a one more click and the program grinds to a halt working through your 250,000 blocked email addresses.
Even theprofessionals in list scanning (the anti virus guys) have a new buzz word. Heuristics. Why, because even with dedicated teams and hand crafted machine code they are simply failing in the scan this list of however many known virus variants.
Thunderbird has and has always has a heuristic junk filter because it became obvious very early in the spam fight that lists just don't work.
Spammers rarely if ever use their own email address or domain. They prefer legitimate email addresses that are active, so they tend to use random addresses picked off mailing lists, or the email address of their hapless malware victim. That way the mail has some verifiable reverse look up credentials.
Spammers also change domains email addresses etc regularly as people using lists, like you, will have blocked those currently in use by tomorrow or the next day, and they want you to see their mail.
Now the heuristics in Thunderbird's junk filters may take a while to work out that every mention of UPS in a mail to you gets junked, but it will work it out, and such mail will get automatic junk status.
I note you appear to want mail to appear unread. I hope you are aware of the fact that reading such mail does not encourage more. That is an urban myth with a gain of truth. Spammers can use images to see who reads mail. But Thunderbird blocks images by default so that can not occur.