Whitelist specific ClamAV signatures¶
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.:
bash
docker-compose logs clamd-mailcow | grep "FOUND"
This line confirms that such was identified:
text
clamd-mailcow_1 | Sat Sep 28 07:43:24 2019 -> instream(local): PUA.Pdf.Trojan.EmbeddedJavaScript-1(e887d2ac324ce90750768b86b63d0749:363325) FOUND
To whitelist this particular signature (and enable sending this type of file attached), add it to the ClamAV signature whitelist file:
bash
echo 'PUA.Pdf.Trojan.EmbeddedJavaScript-1' >> data/conf/clamav/whitelist.ign2
Then restart the clamd-mailcow service container in the mailcow UI or using docker-compose:
bash
docker-compose restart clamd-mailcow
Cleanup cached ClamAV results in Redis:
```
docker-compose exec redis-mailcow /bin/sh¶
/data # redis-cli KEYS rs_cl* | xargs redis-cli DEL /data # exit ```