Can SNFMilter run as a sole anti-spam milter or do I need additional milter filters (exm. SA or Amavis)?

Yes, SNFMilter can run as a sole anti-spam Milter without addition milter filters, either by rejecting messages during SMTP or by telling the MTA to quarantine the messages.

Depending upon your application this may be sufficient. However, many systems use other tools in addition to SNF because they are ubiquitous and offer additional flexibility. Generally using Message Sniffer with or in front of SpamAssassin and other tools dramatically reduces the administrative workload that is typically associated with these tools while simultaneously improving the system's performance.

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