E-mail – 5,000 addresses – Blacklist: Does a web e-mail have this feature?

Does an e-mail service allow the administration of a large blacklist (> = 5000 addresses / domains)?

Why for which request?

Save e-mail addresses from a "subscription bomb". Accounts were targeted and registered for thousands of newsletters, sales catalogs, etc. The inboxes are flooded daily, so there is no practical solution. Years of e-mail addresses would have to be abandoned.

Probably no solutions

  • Microsoft's email service. It seems (like with O365 or Outlook.com) to be limited to 1000 users and domains, regardless of the chosen plan.
  • I have already blocked a cleaned cleanup list (only unique addresses / domains) as a text file. The list size seems to rejuvenate, which is why I think it's solvable, not infinite.
  • Spam tools with Bayesian ratings and / or machine learning. The attacker only logged in to receive tons of emails. A lot of normal companies that should not be labeled.

Possible solutions

  • I have just discovered Sieve scripts. There do not seem to be many e-mail web services
    support them, and their limits are not given enough for given
  • Add-ins / plugins. Some are available for web e-mail services and can be run on the server side (all clients benefit from it). Surprised not to find a simple add-in for it, at least in the MS add-in store and with a short googling. KuTools seemed to have potential but was actually harmful (another story)

More information

  • Fastmail.com supports Siebe scripts, but no guarantee can be given
    Listen to the detailed limitations

  • Actually, I do not want to run my own e-mail server, less practical than this one
    seems to advise me

  • The requirement would not exceed 5000. The attack was big, but finally