14.8.3.1 Supported Milter Message Modification Actions

The Milter interface currently supports the ability to add headers (SMFIF_ADDHDRS), change or delete headers (SMFIF_CHGHDRS), and quarantine messages (SMFIF_QUARANTINE). Changing the message body (SMFIF_CHGBODY), adding recipients (SMFIF_ADDRCPT) and deleting recipients (SMFIF_DELRCPT) are not supported at the present time.