Hermes Agent email signature

Hermes Agent and the mailboxes it sends from

Hermes Agent is an open-source agent from Nous Research, under the MIT license. It runs on your computer or a server, on Linux, macOS, Windows or Android, and you talk to it from a terminal, its desktop app or messaging apps such as Telegram, Slack and WhatsApp.

Hermes sends email three ways:

• The email gateway: people email the agent's address and Hermes replies in the same thread, over IMAP and SMTP, with Gmail, Outlook, Yahoo, Fastmail or any provider that supports them. Nous recommends a dedicated account for the agent.
• The Himalaya skill: the agent reads, composes and sends mail from a mailbox you create for it, on any IMAP and SMTP provider.
• The Google Workspace skill: Hermes signs in to your Google account and sends from your own Gmail. The skill tells Hermes to show you each email and ask before it sends.

Give Hermes your signature

Hermes connects to MCP servers, and Signatoro runs one. Hermes fetches your current signature from it before each email.

• Build and save your signature on Signatoro, free.
• Add Signatoro under mcp_servers in ~/.hermes/config.yaml, with url https://signatoro.com/mcp and auth: oauth.
• In a new terminal, run hermes mcp login signatoro and sign in to Signatoro in the browser that opens. Then restart Hermes, or use /reload-mcp in a running session.
• Add the email signature rule to ~/.hermes/SOUL.md, which Hermes loads in every session, or to the AGENTS.md of the folder you run Hermes from.
• Send one test email from each mailbox Hermes uses, and check the end of it in the receiving inbox.

Your signature or your AI assistant's

Email Hermes sends from your Gmail, through the Google Workspace skill, goes out under your name, so it carries your signature. Email from the agent's own address, through the email gateway or the Himalaya skill, carries an AI assistant signature that says an AI sent it.

Each AI assistant or agent gets its own key or MCP connection and signs as the person it works for or as itself, by default with a line saying it is an AI and whom it acts for. Free includes 1 AI assistant; each person on a Company plan gets 3 AI assistants, and the company gets 3, 10 or 25 agents by size, on top of the people the plan covers.

Add an AI assistant on Signatoro and choose whether it signs as you or as the agent. If Hermes sends only from its own address, set "Signs as" to the assistant for the Hermes connection, under "Connected assistants" on your signature page. If it sends from both, leave "Signs as" on "Me": the rule tells Hermes to pick the signature each email needs and to ask you when it is unclear.

Plain-text replies from the email gateway

The email gateway sends every reply as plain text. Signatoro returns your signature as text as well as HTML, and the email signature rule tells Hermes to append the text version to a plain-text email.

The Google Workspace skill can send HTML email, which carries the HTML signature with its links and images.

Hermes Agent email signature questions

Sources

Checked against Nous Research's Hermes Agent documentation on October 11, 2026.

• Nous Research: Hermes Agent documentation
• Nous Research: Hermes Agent on GitHub
• Hermes Agent: Email setup
• Hermes Agent: Give your agent its own email address
• Hermes Agent: Google Workspace skill
• Hermes Agent: MCP
• Hermes Agent: Context files