Email bombs: How can I defend a web email account against one?
For what reason?
To save email addresses from an email bomb targeted at Office365 and Outlook.com accounts using custom domain addresses (we use/pay for both biz and personal accounts). Targeted accounts were signed up for thousands of newsletters, catalogs, etc. Inboxes are flooded daily. Without a practical solution, years held long term email addresses would have to be given up.
Probably not solutions
Manually blocking addresses one at a time. It's slow and tedious. So far I can only find a small manually maintained blacklist, which is not practical due to time required or item count limitations (cannot see a way to import a large 5000 item list).
I already have a scrubbed/clean list to be blocked (unique addresses/domains only) as a text file. The size of addresses to block seems to taper off eventually, which is why I think this problem is solvable.
Features using Bayesian ratings and/or machine learning. The attacker simply signed up accounts to receive tons of email. A lot from normal businesses that shouldn't be flagged.
- Any combination of features that could create an effective 5,000+ item blacklist of addresses/domains. Doesn't have to be only one specific capability.
- I've researched and found Sieve Scripting, which is a powerful Internet email RFC standard. However, the feature is not well documented and often not even listed as an available feature.
- Add-ins/Plugins. I've searched for plugins to leverage as well but so far strangely haven't found nearly any. (KuTools doesn't work well for this).
- The reason I only need to figure out how to block 5000, is it seems the attack is large, but finite.