The messages which consistently get quarantined are sent from Amazon, eBay and PayPal. Digging into the headers, the X-Spam-Status rules which appear to be the culprits are:
- Code: Select all
DKIM_ADSP_ALL=10
DKIM_ADSP_DISCARD=10
So, there appears to be a DKIM ADSP validation step in my mail filters which fails because Spamgourmet modifies incoming messages in a way that invalidates the DKIM signature.