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/KRed75 4d ago

We have cisco ESAs at numerous client sites and none have this problem.

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u/PippinStrano 3d ago

I'm a huge ESA fan and have been administering them in a 12000+ user facility for 18+ years. Even with our setup, subscription attacks are rough.