If you are a relay operator and using nginx filtering out empty http_user_agent would helped for the time being. b4 thos guy changed it

put this in nginx's server scope

```

server {

server_name my.cool.site;

if ($http_user_agent = "" ) { return 403; }

}

```

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This is an overreaction that breaks many other clients. No sane relay operator should do this.

Instead, consider auth requirements, allow losts, throttling and maybe server side context filters

yep untill we can filter them on relay this will be in use for now.