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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SMTP Proxy in ORF (for Non-Exchange Servers)
To support non-Exchange servers (like IMail, etc.) without Microsoft® IIS SMTP, add an SMTP proxy server to ORF. This proxy would receive the emails first and forward them to the actual mail server.
This would be the same as with Microsoft® IIS SMTP front-ends, but without having to install the IIS SMTP Service first.
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Temporary IP Ban on Repeated Failed SMTP AUTH Attempts
Temporarily ban the sender's IP address based on the number of failed SMTP authentication attempts. The logon failure threshold and ban period could be set by the administrator.
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