Handlers
- Acknowledgment headers
- Message acknowledgment
- After delivery
- ARC Signing
- Archives
- Avoid duplicates
- Cleansing headers
- Cooking headers
- Message decoration
- Digests
- DMARC Mitigations
- File recipients
- Content filtering
- Calculating recipients
- NNTP Gateway
- List owner recipients
- Reply-to munging
- Automatic response handler
- RFC 2919 and 2369 headers
- Subject prefixes
- Message tagger
- The outgoing handler
- Validate Authenticity