Classification (Please choose one option):

• Crash/Hang/Data loss
• WebUI/Usability
• Serious bug
• Other bug
• Feature
• Enhancement

Reproducibility (Please choose one option):

• Always
• Sometimes
• Rarely
• Unable
• I didn’t try
• Not applicable

Rspamd version:

1.6.3

Operation system, CPU, memory and environment:

CentOS 7, kernel 4.12.6, vcpu 4, ram 8Gb

Description (Please provide a descriptive summary of the issue):

Hello. I tried to configure module dkim_signing for signing different domains with different dkim keys.
I have some third-level domains. I sent mail from my postfix with one of them, but rspamd didn't properly select the domain name. I tried to use different setting, but my result always the same - wrong.
Please, tell me, what am I doing wrong? =)

Steps to reproduce:

telnet first.mydomain.com 25
HELO itsme.localhost
MAIL FROM:[email protected]
rcpt to: [email protected]
DATA
FROM: [email protected]
TO: [email protected]
SUBJECT: DKIM test
DKIM test
.

Expected results:

DKIM: PASS

Actual results:

2017-08-24 09:58:52 #11(normal) <f35cef>; task; lua_dkim_sign_handler: cannot load dkim key /var/lib/rspamd/arc/mydomain.com.arc.key: cannot stat private key /var/lib/rspamd/arc/mydomain.com.arc.key: No such file or directory
2017-08-24 09:58:52 #11(normal) <f35cef>; task; lua_dkim_sign_handler: cannot load dkim key /var/lib/rspamd/dkim/mydomain.com.dkim.key: cannot stat private key /var/lib/rspamd/dkim/mydomain.com.dkim.key: No such file or directory

Configuration:

postfix/main.conf
...
smtpd_milters = inet:first.mydomain.com:11332
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_default_action = accept
milter_protocol = 6
...

rspamd/rspamd.conf
...
dkim_signing {
allow_envfrom_empty = true;
allow_hdrfrom_mismatch = false;
allow_hdrfrom_multiple = false;
allow_username_mismatch = false;
auth_only = true;
sign_local = true;
symbol = "DKIM_SIGNED";
try_fallback = true;
use_domain = "header";
use_domain_sign_local = "header";
use_esld = true;
use_redis = false;

domain {
first.mydomain.com {
path = "/var/lib/rspamd/dkim/first.mydomain.com.key";
selector = "mail";}
}
}

Additional information:

If I set default path and default selector I see in the original text of the letter:
DKIM: | UNKNOWN, domain nul
dkim=temperror (no key for signature) [email protected] header.s=mail header.b=...;