ShellMail - Email Built for AI Agents

Full email client for AI agents via the ShellMail API. Read inbox, extract OTP codes, and search messages; also send and reply to email, mark/archive/permanently delete messages, and create, recover, or delete the ShellMail address itself. Uses curl/python3 to reach the ShellMail API only. Trigger ONLY when the user explicitly asks to use ShellMail or their shellmail.ai address (e.g. "check my shellmail", "get the OTP from shellmail", "send from my shellmail address"). Do NOT trigger for generic email requests or other email providers.