Your search for "filtering" returned 43 results:
DONE Attachment Quarantine
Option to quarantine specified attachments of emails for further inspection or release by the administrator (instead of dropping them entirely).
5 comments
35
Recipient Validation to Support Multiple LDAP Paths
Currently, only a single LDAP path could be set for the Active Directory-based Recipient Validation feature, so ORF can query the valid recipient list from a single Active Directory only. This improvement would allow ORF users with multiple Active Directories to take advantage of the Recipient Validation test without importing the valid recipient addresses into an SQL database or text file from each Active Directory periodically.
25
New Action: Drop Email Silently
Add a new action to ORF that allows dropping the email silently at On Arrival, without returning an SMTP response to the sending server. It would appear that the local server accepts the blacklisted email, but it would cancel the delivery without telling the sender.
15
Challenge / Response (C/R) Spam Filtering
A feature to send a reply email automatically with a challenge to unknown senders. The sender is asked to perform some action to assure delivery of the original message, which would otherwise not be delivered. Senders that have previously performed the challenging action would be automatically whitelisted.
25