AI email assistant: a guide

What an AI email assistant is

An AI email assistant is software that works on your mailbox rather than beside it. It reads the thread, drafts the reply, sorts what arrived, proposes the meeting and keeps track of what you are waiting on.

The distinction that matters is not how well it writes, because every model writes well now. It is whether it can change anything: send, archive, delete, move four thousand messages, put an event on your calendar. A chat window that summarizes an email you pasted into it is a different product. Useful, but it is not touching your mail, and it cannot send the wrong thing either.

AI email, AI mail, AI inbox: one question in different words

People search for this a dozen ways. AI email. AI mail. AI inbox. Email AI. AI email assistant. Underneath all of them sits the same question: can something take the tedious half of my inbox off me without creating a new kind of mess.

The answer depends far more on the boundaries a product sets than on the model behind it. So here are the five things to find out, in the order they will actually decide your choice.

What it can change without asking you

Find this out before the feature list. Some assistants only ever write a draft into your drafts folder, which is safe and limited. Some can send, archive and delete on their own. Some sit between and do not document where the line is.

Ask three questions: what does it do on its own, what does it show you before it acts, and what does it tell you afterwards. If the help pages do not answer those, try it on a message that does not matter and watch what happens.

Where you approve

A review step is what makes handing over a mailbox reasonable, because a sent message cannot be unsent and a deleted thread is gone. The useful version of it shows the sending account, the recipients and the wording, and for a bulk job the scope it will touch. A draft button on its own answers none of that.

AI that waits for your approval walks through the six seconds of checking, including the part people skip: approving starts the work, it does not finish it.

Where your mail is stored

Every product in this category says it takes privacy seriously. Far fewer say which bytes land in whose database. Read for specifics: does it keep message bodies, does it keep attachments, what happens to the text when you ask an AI about a message, and is any of it used to train a model.

Which providers it supports

This settles your shortlist faster than anything else, and most people get to it last. Several well-known AI email tools are Gmail and Google Workspace only. If one address in your day ends in Microsoft 365, a Gmail-only tool leaves you running two apps, which is the thing you were trying to stop doing.

What it costs, and whether you can test it properly

Several tools in this field start around $30 a seat a month behind a one or two week trial. Fourteen days is enough to judge an interface. It is not enough to know whether an assistant helps in a bad week, and a bad week is what you are buying for.

How Otto answers those five

What it can change. Otto reads, searches, summarizes and prepares work on its own. Sends, deletes and bulk changes do not happen on their own.

Where you approve. Each of those comes back as a card with the sending account, the recipients, the wording and, for a bulk job, the scope. You approve it, edit it, or throw it away.

Where your mail is stored. Otto never stores the body of your emails or your attachments; they are fetched live from Gmail or Outlook each time you open one. It keeps a light metadata index of sender, subject, dates and flags so folders load quickly. The exceptions are named in what Otto stores.

Which providers. Gmail and Outlook in one app, with the same assistant and the same shortcuts. The selected account supplies the mail, the calendar and the task list, so a work reply cannot slip out from a personal address.

What it costs. Free connects one account with core mail, calendar and tasks and an AI allowance, with no clock on it. Plus is $4.99 a month and Pro is $14.99. Pricing has the current tiers.

Two more things decide how the first week feels. Otto is one app for mail, calendar and tasks rather than three, so a single thread becomes a reply, an event and a task in one pass, on the web and on iPhone. And it is built to stay out of your way: new mail is pushed to it by Gmail and Outlook rather than polled, folder switches come off a live mirror of your mailbox, and the whole inbox is drivable from the keyboard.

Under that sit the unglamorous parts that decide whether a week survives: snooze, follow-up nudges, scheduled send, undo send, filters and rules, bulk actions across a whole search, saved snippets, a shared inbox for teams, and a memory of your preferences so drafts sound like you by the second week. Otto AI is the short version of the whole thing.

A short tour of the alternatives

The comparison hub has the full field, each one with prices and an honest verdict. In brief:

Superhuman is the keyboard-speed inbox, from $30 a month, no free tier, with a native Windows app that Otto does not have. Shortwave is strong AI help inside the thread, for Gmail and Google Workspace only. Spark has the most generous free tier here, with unlimited accounts across iCloud, Yahoo and IMAP, and no task list. SaneBox is not a client at all: it sorts mail in the app you already use and reads headers only, which is the smallest data footprint in this list. Missive is built for teams working one shared queue, from $14 a user, and also handles WhatsApp and SMS. Gmail with Gemini is free for summaries and Help me write, and is Gmail only.

None of those are wrong choices. They are answers to different questions.

Which one you are

If you run a company, the problem is finding the four threads that matter inside three hundred: Otto for founders. If you are moving forty candidates through interviews, it is scheduling and follow-ups: for recruiters. If client threads pass between people, it is the handoff: for agencies. If you are the whole back office, it is one client email that is really three jobs: for freelancers.

Where to start

Connect one real account rather than a test one, and run an ordinary morning through it. Ask for a reply you have been putting off, accept a meeting, set one follow-up, then look at where each of the three landed.

The glossary covers the vocabulary if any of it is new, and Gmail and Outlook in one place is worth reading first if you run both providers.