PowerMTA 4.5 is designed to solve the complexities of modern email delivery through several technical enhancements:
For senders concerned about spam complaints (and you should be), version 4.5 handles FBLs natively. It listens for ARF (Abuse Reporting Format) reports, parses them, and can automatically suppress complainers into a flat-file database or a Redis instance before your campaign hits them again. powermta 4.5