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Tweaks

Spam filter thresholds (global)

Each user is able to change their spam rating individually. To define a new server-wide limit, edit data/conf/rspamd/local.d/actions.conf:

reject = 15;
add_header = 8;
greylist = 7;

Save the file and restart "rspamd-mailcow":

docker compose restart rspamd-mailcow

docker-compose restart rspamd-mailcow

Warning

Existing settings of users will not be overwritten!

To reset custom defined thresholds, run:

source mailcow.conf
docker compose exec mysql-mailcow mysql -umailcow -p$DBPASS mailcow -e "delete from filterconf where option = 'highspamlevel' or option = 'lowspamlevel';"
# or:
docker compose exec mysql-mailcow mysql -umailcow -p$DBPASS mailcow -e "delete from filterconf where option = 'highspamlevel' or option = 'lowspamlevel' and object = 'only-this-mailbox@example.org';"

source mailcow.conf
docker-compose exec mysql-mailcow mysql -umailcow -p$DBPASS mailcow -e "delete from filterconf where option = 'highspamlevel' or option = 'lowspamlevel';"
# or:
docker-compose exec mysql-mailcow mysql -umailcow -p$DBPASS mailcow -e "delete from filterconf where option = 'highspamlevel' or option = 'lowspamlevel' and object = 'only-this-mailbox@example.org';"

Custom reject messages

The default spam reject message can be changed by adding a new file data/conf/rspamd/override.d/worker-proxy.custom.inc with the following content:

reject_message = "My custom reject message";

Save the file and restart Rspamd:

docker compose restart rspamd-mailcow

docker-compose restart rspamd-mailcow

While the above works for rejected mails with a high spam score, prefilter reject actions will ignore this setting. For these maps, the multimap module in Rspamd needs to be adjusted:

  1. Find prefilet reject symbol for which you want change message, to do it run: grep -R "SYMBOL_YOU_WANT_TO_ADJUST" /opt/mailcow-dockerized/data/conf/rspamd/

  2. Add your custom message as new line:

    GLOBAL_RCPT_BL {
type = "rcpt";
map = "${LOCAL_CONFDIR}/custom/global_rcpt_blacklist.map";
regexp = true;
prefilter = true;
action = "reject";
message = "Sending mail to this recipient is prohibited by postmaster@your.domain";
}

  3. Save the file and restart Rspamd:

docker compose restart rspamd-mailcow

docker-compose restart rspamd-mailcow

Discard instead of reject

If you want to silently drop a message, create or edit the file data/conf/rspamd/override.d/worker-proxy.custom.inc and add the following content:

discard_on_reject = true;

Restart Rspamd:

docker compose restart rspamd-mailcow

docker-compose restart rspamd-mailcow