Bug 430397

Outlook (desktop, not web), for all its faults, has a really powerful feature: the ability to import a list of addresses to be automatically blocked. https://support.microsoft.com/en-us/office/filter-junk-email-and-spam-in-outlook-on-the-web-db786e79-54e2-40cc-904f-d89d57b7f41d

For us professional translators this is an extremely useful feature because we can then make use of the translator scammers email list (http://www.translator-scammers.com/translator-scammers-info.htm#emails), save it to .txt and import to Outlook to automatically block any scamming emails.

The imported file could be a newline- or space-separated list of email addresses, and the action taken could be sending the email to trash, spam, or a new folder.

That list for example contains over 18,000 addresses; it's entirely impractical to add such number of addresses one by one. I wouldn't mind if it's just a new filter capability or a plugin that makes use of spamassassin; this feature would be awesome and unique on linux, as far as I know only Outlook can do this.