I have my mailserver setup configured based on this guideline (German), with the possibly important detail that I use CentOS 8 as a base OS instead of Debian. Everything works fine, except that I cannot manage to integrate rspamd into my setup.
If I wire up postfix to connect to rspamd by including the following lines in main.cf:
smtpd_milters = inet:localhost:11332
non_smtpd_milters = inet:localhost:11332
milter_protocol = 6
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_default_action = accept
and send an email, I see the following error from postfix:
postfix/submission/smtpd[125562]: fatal: host/service localhost/11332 not found: Device or resource busy
The worker-proxy.inc config for rspamd looks like
bind_socket = "localhost:11332";
milter = yes;
timeout = 120s;
upstream "local" {
default = yes;
self_scan = yes;
}
If I manually connect to rspamd with telnet, I don't see this error:
# telnet localhost 11332
Trying ::1...
Connected to localhost.
Escape character is '^]'.
So rspamd is listening on the expected port but postfix cannot connect to it, I do not know how to debug this any further and would appreciate any advice on how to proceed. Thanks.
After randomly trying various config changes, I stumbled upon the solution. For whatever reason, postfix cannot resolve
localhost. I changed the following entries in/etc/postfix/main.cf:to
and all of sudden, no more errors!