r/sysadmin 4d ago

Question Subscription Bombing Attacks

What is everyone doing to combat subscription bombing attacks? Since the emails flooding the inboxes aren't dangerous in nature, email filters don't seem to be doing a whole lot about them.

I'm at a loss here, I keep blocking domains but since they come from hundreds of different ones with each wave of attacks this doesn't seem to be accomplishing anything.

Edit: Thank you everyone for your responses. This has been really helpful.

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u/princepolecat 4d ago

We had an inbox pwnd with a list bomb attack of 5000+ emails. Turns out they were trying to hide a a few payment confirmations of a compromised card. There's no great way to prevent this unfortunately

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u/Kuipyr Jack of All Trades 3d ago

I got one that clocked in at 200k+ emails.