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Re:Ask HN: How do you protect your Mailserver from DDoS Atta... by ThePhysicist on Friday August 14, 2020 @03:20AM (#24154829)
Cloudflare recently introduced a product that seemingly can protect arbitrary TCP-based traffic (https://www.cloudflare.com/products/cloudflare-spectrum/), haven't used that myself though, it seems to not be part of the standard offering for now.

Some of the simpler DDoS attacks can be mitigated by kernel settings and iptables (see e.g. https://javapipe.com/blog/iptables-ddos-protection/), but that won't help you much against larger attacks.

Re:Ask HN: How do you protect your Mailserver from DDoS Atta... by Wronnay on Friday August 14, 2020 @03:33AM (#24154939)
Cloudflare Spectrum seems to be for companies or good paying customers - my budget is limited as this is a personal mailserver ...

The article about iptables rules looks very promising :)