91 Zeilen
3,5 KiB
Markdown
91 Zeilen
3,5 KiB
Markdown
Rspamd is used for AV handling, DKIM signing and SPAM handling. It's a powerful and fast filter system. For a more in-depth documentation on Rspamd please visit its [own documentation](https://rspamd.com/doc/index.html).
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## Learn Spam & Ham
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Rspamd learns mail as spam or ham when you move a message in or out of the junk folder to any mailbox besides trash.
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This is achieved by using the Dovecot plugin "antispam" and a simple parser script.
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Rspamd also auto-learns mail when a high or low score is detected (see https://rspamd.com/doc/configuration/statistic.html#autolearning)
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The bayes statistics are written to Redis as keys `BAYES_HAM` and `BAYES_SPAM`.
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You can also use Rspamd's web UI to learn ham and / or spam or to adjust certain settings of Rspamd.
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### Learn Spam or Ham from existing directory
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You can use a one-liner to learn mail in plain-text (uncompressed) format:
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```
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# Ham
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for file in /my/folder/cur/*; do docker exec -i $(docker-compose ps -q rspamd-mailcow) rspamc learn_ham < $file; done
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# Spam
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for file in /my/folder/.Junk/cur/*; do docker exec -i $(docker-compose ps -q rspamd-mailcow) rspamc learn_spam < $file; done
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```
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Consider attaching a local folder as new volume to `rspamd-mailcow` in `docker-compose.yml` and learn given files inside the container. This can be used as workaround to parse compressed data with zcat. Example:
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```
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for file in /data/old_mail/.Junk/cur/*; do rspamc learn_spam < zcat $file; done
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```
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### Reset learned data
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You need to delete keys in Redis to reset learned mail, so create a copy of your Redis database now:
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**Backup database**
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```
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# It is better to stop Redis before you copy the file.
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cp /var/lib/docker/volumes/mailcowdockerized_redis-vol-1/_data/dump.rdb /root/
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```
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**Reset Bayes data**
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```
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docker-compose exec redis-mailcow sh -c 'redis-cli --scan --pattern BAYES_* | xargs redis-cli del'
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docker-compose exec redis-mailcow sh -c 'redis-cli --scan --pattern RS* | xargs redis-cli del'
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```
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If it complains about...
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```
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(error) ERR wrong number of arguments for 'del' command
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```
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...the key pattern was not found and thus no data is available to delete.
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## CLI tools
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```
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docker-compose exec rspamd-mailcow rspamc --help
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docker-compose exec rspamd-mailcow rspamadm --help
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```
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## Disable Greylisting
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You can disable rspamd's greylisting server-wide by editing:
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`{mailcow-dir}/data/conf/rspamd/local.d/greylist.conf`
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Simply add the line:
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`enabled = false;`
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Save the file and then restart the rspamd container.
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See [Rspamd documentation](https://rspamd.com/doc/index.html)
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## Whitelist specific ClamAV signatures
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You may find that legitimate (clean) mail is being blocked by ClamAV (Rspamd will flag the mail with `VIRUS_FOUND`). For instance, interactive PDF form attachments are blocked by default because the embedded Javascript code may be used for nefarious purposes. Confirm by looking at the clamd logs, e.g.:
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`docker-compose logs clamd-mailcow | grep FOUND`
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This line confirms that such was identified:
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`clamd-mailcow_1 | Sat Sep 28 07:43:24 2019 -> instream(local): PUA.Pdf.Trojan.EmbeddedJavaScript-1(e887d2ac324ce90750768b86b63d0749:363325) FOUND`
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To whitelist this particular signature (and enable sending this type of file attached), add it to the ClamAV signature whitelist file:
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`echo 'PUA.Pdf.Trojan.EmbeddedJavaScript-1' >> data/conf/clamav/whitelist.ign2`
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Then restart the clamd-mailcow service container in the mailcow UI, or using docker-compose:
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`docker-compose restart clamd-mailcow`
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