Plainmail

Real mailboxes on all your domains for $5 a month, flat: up to 50 domains, 100 mailboxes and 25 GB. Ask Claude for hello@yourdomain through the MCP server, or use the CLI or API. Plainmail writes the MX, SPF, DKIM and DMARC records at Cloudflare, Vercel or Porkbun, checks them and creates the mailbox. It's a normal IMAP/SMTP account, so it sits in Apple Mail, the Gmail app, Outlook or Thunderbird. Built for mail between people, not bulk mail.