Handing an agent a Gmail account works until it does not. MCPmailer gives each agent its own address, key, and quotas built for automation.
Human mailboxes · Gmail claims checked July 2026
The most common way to give an agent email today is to create a Google account, or borrow a human's, and drive it through the Gmail API or a community MCP server. It is free, familiar, works on the first try, and for a personal assistant it is the right answer.
If the agent is your assistant, acting inside your own mailbox on your own mail, Gmail plus an MCP server is correct and nothing here replaces it. Reading your mail requires access to your mail.
The trouble arrives later and all at once: an auth model that assumes a human is present, send caps written for a person, terms that treat automated sending as abuse, a seat licence per agent, and no way to let a colleague read what the agent said without handing over the mailbox. Each agent here gets an address on your domain, a scoped key, quotas designed for software, and a dashboard for whoever is accountable.
Gmail MCP servers use interactive OAuth with scopes like gmail.readonly and gmail.compose. There is no service-account route for consumer accounts, so a background agent with no human present cannot complete or repair the flow. When the token breaks on a Sunday, the agent is simply down until someone clicks.
Free accounts stop around 500 sends a day and Workspace around 2,000, and the API charges roughly 100 quota units per send against a per-user-per-minute ceiling. Exceed the daily limit and sending is blocked for 24 hours. Our limits are reply-first: answering a thread is near-unrestricted, cold outreach is what gets rationed.
Automated or bulk sending from a consumer account is against the terms, and suspensions happen. You lose the address, the threads, and the relationships attached to them. A dedicated agent subdomain keeps that risk off the identity your business depends on, and keeps agent behaviour away from your people's deliverability.
To let a teammate check what a Gmail-driven agent wrote, you give them the account or set up Workspace delegation. Here, every thread is readable in the dashboard by anyone in your workspace, and a human can take a conversation over and reply as themselves.
Every row is a claim we could defend with their documentation open beside it. Where they are ahead, the row says so.
Usually a morning. The awkward part is telling people the address changed, so most teams forward for a while.
Create the agent and its address
support@you.mcpmailer.email immediately, or on agents.yourcompany.com once DNS is verified.
Forward the old account
Point the Gmail address at the new one so in-flight threads keep arriving while you cut over.
Swap the MCP server entry
Replace the Gmail MCP server with ours and a bearer key. No consent screen, no refresh token to babysit.
Revoke the OAuth grant
Then delete the account, or keep it as a human mailbox with no automation attached.
Technically yes, through the Gmail API or a community MCP server with interactive OAuth. The practical limits are the daily send caps, no service-account path for consumer accounts, a seat licence per agent, and suspension risk for automated sending.
Bulk or unsolicited automated sending from a consumer account can get it suspended, and you lose the address and its history with it. Sending from a dedicated subdomain keeps that risk away from your primary identity.
Roughly 500 on a free account and 2,000 on Workspace, and the API meters sends at about 100 quota units each. Our free tier is 3,000 a month at 100 a day, and paid plans drop the daily cap entirely.
Several community ones, and they work for reading and drafting. They inherit Gmail's auth model, so the unattended-agent problem stays.
A shared mailbox plus delegation can work, at a licence and an admin conversation per agent, and you still get human-sized send limits and no reply-first distinction.
Your people keep their mailboxes. Your agents get their own, on a subdomain, with keys you can revoke one at a time and quotas written for software.
The free tier is 3,000 emails a month across three agent inboxes, no card, with receiving, threading, and search included. Enough to watch a real conversation happen before you decide.
More Human mailboxes