Penny Post Headers
This document describes the headers inserted by
PennyPost in outgoing email.
PennyPost inserts headers for
HashCash compatible with the formats described at
hashcash.org∞.
Hashcash version 0 header
x-hashcash: 0:070812:test@fun.com:2791d450:2973b1d3
x-hashcash: Stamp version:Stamp generation date (YYMMDD):Recipient email:Stamp Id:Stamp value
Hashcash version 1 header
x-hashcash: 1:20:070812:test@fun.com:IP=127.9.4.3:7c77c852:36f26706
x-hashcash: Stamp version:StampCost:Stamp generation date (YYMMDD):Recipient email:Extended data:Stamp Id:Stamp value
MBound version 0 header
x-mbound: 0:10:100:070812:test@fun.com:IP=127.9.4.3:20bb8f3c:d1a94fc2
x-mbound: Stamp version:StampCost:Stamp depth:Stamp generation date (YYMMDD):Recipient email:Extended data:Stamp Id:Stamp value
Stamp Protocols
This header tells the recipient the stamp protocols recognised by the sender and their minimum costs acceptable to the sender. This is just an informative header.
x-stampprotocols: mbound:0:10:3000:5000;hashcash:1:20
Each supported protocol is provided together with its limit arguments. Multiple protocols are separated by a single semi-colon (;). The protocol that appears first is preferred compared to others.
MBound Protocol
mbound:0:10:3000:5000
mbound:max-version-supported:min-cost-required:min-depth-required:max-depth-accepted
HashCash Protocol
hashcash:1:20
hashcash:max-version-supported:min-cost-required
CategoryImplementationDocs
