On Thu, Aug 27, 2026 at 03:38:31PM +0200, Ralph Seichter via mailop wrote: > * Peter Corlett via mailop: >> Hetzner has an elaborate filtering and monitoring system in place on its >> customer servers to prevent abuse. Those which seem relevant here are >> that servers are effectively directly plugged into a router[0] and cannot >> use IP addresses not assigned to them, and outgoing port 25 is blocked by >> default and is only lifted on request. > While Hetzner indeed monitors network traffic to catch, for example, > network scans originating from their infrastructure, I can't confirm the > blocking of TCP port 25 as a default measure. Is this perhaps a recent > change?
They started doing it some time around 2020 and didn't enable it retroactively. I believe the restriction is per account, so if you've been with them longer than that, any new servers you spin up will also be unrestricted. 2020 is now long enough ago that most Hetzner accounts probably have this restriction thanks to customer churn. > None of the physical or virtual Hetzner servers I have operated for both > customers and myself over the past 20ish years had any port restrictions. > A good portion of these servers were, in fact, dedicated mail servers, so > I would have noticed blocks on port 25. I also run a mailserver at Hetzner and have been a customer about as long as you. I was initially confused when I first started hearing people complaining about how they opened an account and couldn't send mail, because it worked just fine for me. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
