[Rspamd-Users] Rspamd configtest reports “cannot add rule” – Help with multimap conflict wanted

[Andreas]

Hello everyone,

I'm currently encountering a problem with my Rspamd configuration on Debian 
Bookworm.

When testing my settings with

rspamadm configtest

I receive the following messages:

cannot add rule: "BLACKLISTED_SENDER_DOMAINS"
redefining fallback backend from /etc/rspamd/maps.d/surbl-whitelist.inc to /
etc/rspamd/maps.d/surbl-whitelist.inc
syntax OK

The part of my multimap.conf:

BLACKLISTED_SENDER_DOMAINS {  
   type = "smtp_from";  
   filter = "email:domain";  
   map = "${LOCAL_CONFDIR}/local.d/maps.d/banned_sender_domain.map";  
   action = "reject";  
   prefilter = true;  
   priority = 100;  
   messages = "This blacklisted sender domain is blocked!";  
   symbol = "BLACKLISTED_DOMAINS"; 
} 

BANNED_EXTENSIONS { 
 type = "filename"; 
 filter = "extension"; 
 map = "${LOCAL_CONFDIR}/local.d/maps.d/banned_extensions.map"; 
 symbol = "BANNED_EXTENSIONS"; 
 action = "reject"; 
 prefilter = true; 
 messages = "A restricted file type was found"; 
}


That means the syntax is basically correct, but Rspamd refuses to add the 
"BLACKLISTED_SENDER_DOMAINS" rule because it apparently already exists or is 
defined twice. Furthermore, the surbl-whitelist.inc map is defined twice as a 
"fallback backend" – a kind of redefinition, which indicates a conflict.

I took the following steps to find the problem:

The file /etc/rspamd/local.d/multimap.conf contains the definitions for my 
multimap rules, such as BANNED_DOMAINS.

I searched for additional definitions using grep -r BANNED_DOMAINS /etc/
rspamd/, as well as for surbl-whitelist.inc with

grep -r surbl-whitelist.inc /etc/rspamd/

This found entries in /etc/rspamd/modules.d/rbl.conf and /etc/rspamd/local.d/
rbl.conf that reference surbl-whitelist.inc multiple times.

I restarted Rspamd several times and monitored the logs, but found no evidence 
of duplicate multimap rules or other obvious conflicts.

The directory /var/lib/rspamd/dynamic doesn't exist, so dynamic configuration 
files there can't be the cause.

I suspect that Rspamd isn't accepting the multimap rule due to a duplicate 
definition or a conflicting configuration in one of the includes, but I can't find 
the exact location.

Does anyone have any ideas how I can avoid the duplicate map definition or how 
I can resolve the "cannot add rule" error?

Best regards

Andreas