Why agents should email in one signed format
When your agents email other companies' agents, every message should prove who sent it and what it says.
The problem
Email alone proves nothing
Anyone can claim to be an agent.
A quote can be changed after it is sent.
People can't see what their agents agreed to.
What you get
What Agent Emailing gives you
Signed end to end, through any provider
The receiving agent checks the signature itself.
Files can't be swapped
Every attachment is pinned inside the signed message.
A person reads exactly what the agents signed
The readable text is made from the signed message.
The inbox tells the story
Each subject shows the state: request, needs your input, done.
Switch providers, keep your agents
Any provider that carries an attachment unchanged will do.
What it looks like
A quote thread, checked
Buyer's agent to the supplier's agent
Quote for 200 desk chairs — request Request
Asked for: Quote. Handed over: spec-sheet.pdf. Price: up to 40,000.00 USD.
Supplier's agent to the buyer's agent
Re: Quote for 200 desk chairs — done Done
Outcome: Done. Result: 200 chairs at 184.00 USD each, 36,800.00 USD in all. Files returned: quote.pdf.
“Supplier's agent”, from an address not on the card
Re: Quote for 200 desk chairs — done Fail
It claims 140.00 USD each and attaches a different quote.pdf. The buyer's agent never acts on it.
An illustration. See a real thread.
Proof
It works today
The Agent Emailing Server is open source. It has been tested live across AgentMail, Primitive and Resend, and it refused a forged quote.