Email is where most small businesses lose their afternoon. A 20 person company usually runs two or three shared mailboxes plus everyone's personal inbox, and the shared ones take somewhere between 80 and 150 messages a day. Most of that volume is the same twelve questions asked in different words.

So "automate the inbox" sounds obvious. It is also the request that goes wrong most often, because people buy a tool expecting it to answer customers on its own. Here is what an AI email assistant actually does well today, what it still cannot do, and how to set one up without putting your reputation in the hands of a model.

What works right now

Four jobs are reliable enough to build a process around.

  • Drafting the reply you were going to write anyway. Give it the thread and a one line instruction and you get a usable draft in about five seconds. Editing a draft takes roughly a third of the time writing one does.
  • Triage. Sorting incoming mail into categories you define, such as new enquiry, existing job, invoice question, supplier, and noise. This is the highest value use and the least discussed.
  • Summarizing long threads. A 40 message chain about a job becomes six lines before you call the customer back.
  • Pulling structured details out of messages. Address, quantity, date requested, PO number, moved into your job sheet or CRM without retyping.

Pick the one of those four that costs your team the most hours this month and start there. For most trades and service businesses it is triage. For professional services it is drafting.

What it cannot do

It cannot make commitments. Prices, lead times, availability, scope, and anything with legal weight need a person, because the model will produce a confident answer whether or not it has the facts. It also cannot see what is outside the email: the van that broke down, the supplier who is behind, the customer you decided last week to stop taking work from.

It will not notice that a polite message is from your largest client and needs a call instead of a reply. And it cannot be trusted to send anything without a human reading it first, which is the single most important rule on this page.

Write down the list of things nobody may promise in an AI-drafted email, and pin it next to the approved tools list in your AI usage policy.

What it costs

You are probably already paying for most of it.

  • Microsoft 365 Copilot adds roughly 30 dollars per user per month on top of your existing Microsoft licence and works inside Outlook.
  • Google Workspace now bundles its AI features into the standard business tiers, which run in the region of 14 to 22 dollars per user per month, so Gmail users often have this already.
  • Shared inbox tools such as Front or Missive sit in the 15 to 60 dollars per user per month range depending on tier, and their AI features are aimed squarely at triage and routing.
  • Automation plumbing like Zapier or Make, for moving details from an email into another system, starts around 20 dollars a month and rarely needs to go above 100 for a business this size.

List prices move, so check before you commit. Before you buy anything new, open your current subscription list and confirm what is already included. It is common to find a business paying for an AI feature nobody ever switched on.

Set it up on drafts only

Turn off any feature that sends, replies, or auto-responds without a person clicking send. Every assistant should write into the drafts folder. A wrong draft costs ten seconds. A wrong sent message to a customer costs a relationship, and you will find out about it days later.

Triage rules are the exception, because misfiling a message is recoverable. Let the tool label and route freely, and keep a rule that nothing is deleted or archived automatically. Go into your settings today and confirm nothing is set to send on your behalf.

Start with one shared mailbox

Do not roll this out to everyone's personal inbox. Take the busiest shared mailbox, define five or six categories, and run it for two weeks with one person responsible. Count two things: how long the first response takes, and how many messages needed a human to write from scratch.

If first response time drops and the from-scratch count falls below half, expand to the next mailbox. If neither number moves, the problem was never the writing, it was that nobody owned the mailbox. That is a management fix, not a software purchase.

Give it two weeks and write both numbers on paper before you decide anything.

If you want a hand picking the tool and setting the triage categories for your own mailboxes, the first call is free and takes about 30 minutes. We look at what you already pay for, agree the list of things no draft may promise, and set up one mailbox properly so you can judge it on real numbers. Get in touch and pick a time.