Your search for "filtering" returned 43 results:
DONE Configurable Action for SPF SoftFail
Currently, it is only possible to treat SPF Fail and SoftFail the same way, i.e. to perform the same action for SoftFails as for regular blacklistings ("Blacklist email on SPF SoftFail" option). This would allow e.g. tagging or redirecting the email, even if the default blacklisting action is set to rejection.
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Add BCC Recipient Addresses to Emails
Normally, BCC (Blind Carbon Copy) recipients are not recorded in emails anywhere. Add a new option to ORF that records the original envelope recipient list (which includes the local BCC'd recipients) to the email header as e.g. X-Envelope Recipients: Recipient1;Recipient2, etc.
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Support More DNS Whitelists
Support more DNS-based reputation services in addition to Sender Score Certified, such as DNSWL.org. ORF could query the sender IP address against these lists and whitelist (allow through) trusted senders.
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DONE Support for DomainKeys Identified Mail (DKIM) RFC 4871
DKIM uses public-key cryptography to allow the sender to electronically sign legitimate emails in a way that can be verified by recipients. Prominent email service providers implementing DKIM (or its slightly different predecessor, DomainKeys) include Yahoo and Gmail. Any mail from these domains should carry a DKIM signature, and if the recipient knows this, they can discard mail that hasn't been signed, or that has an invalid signature.
Learn more at http://dkim.org.
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