Best Claude MCP servers for business automation in 2026

I’m trying to figure out which Claude MCP servers are actually useful for running a business not just cool demos. I’m mostly interested in stuff that connects Claude to things you already deal with every week. Email, docs, invoices, payments, banking, client follow-ups, basic admin etc. Feels like MCP gets way more interesting once Claude can pull context from the tools you use instead of you constantly copying everything into chat. What Claude MCP servers are you guys using for business automation? Especially interested in ones you’ve kept using after the first week