How to choose the best email client for Mac: 7 questions

Most “best email client for Mac” lists are somebody’s ranking of the apps that suited them. This is the other half of that question: the seven things that actually decide which client suits you, and where FlowMail lands on each. FlowMail is ours, so read the last two sections with that in mind.

Start with the one already on your Mac

Apple Mail comes with macOS, costs nothing, and handles every account type below. For a lot of people it is genuinely the right answer — if your inbox is not a problem, you do not have a problem to solve, and switching client is a fortnight of small friction bought for nothing.

People go looking for an alternative for a short list of reasons: their provider works badly, mail arrives late, they cannot keep track of what they have not dealt with yet, they repeat the same three actions every day, or they want mail summarised without paying by the message. Each of those is a question with a testable answer.

1. Does it actually work with your provider?

“Works with Gmail” and “works with IMAP” are different promises. Some Mac clients are Gmail specialists that treat everything else as second class; others speak plain IMAP and have no idea what a Gmail label is.

The specific thing to check is how it signs you in. Microsoft and Google accounts should go through their own sign-in pages, so your password is never typed into the app at all. Everything else means IMAP and SMTP — and ideally the server settings looked up for you rather than you hunting port numbers on a support forum.

FlowMail: Microsoft — Outlook, Hotmail, Office 365 — and Google, through their own sign-in pages. iCloud, Yahoo, Fastmail and anything else that speaks IMAP and SMTP, with settings discovered for you. As many accounts as you like, including on the free version.

2. Does new mail arrive, or does the app go and look?

A client that polls every five or fifteen minutes is a client that is wrong about your inbox most of the time. One holding an open connection knows the moment something lands. Worth checking which folders that covers, because an app can hold a live connection to the Inbox and quietly poll everything else.

FlowMail: live connections to Inbox, Sent and Archive, so new mail appears without waiting for a poll. Notifications for genuinely new Inbox mail, grouped rather than one per message, and clicking one opens that message. Both are in the free version — an email client that does not tell you about email is not much of an email client.

3. What happens to the mail you cannot deal with today?

This is the real complaint behind most inbox complaints, and very few clients answer it. A list is a poor instrument here: read/unread is a two-state flag being asked to carry “I have seen this”, “I am working on it” and “I am waiting on somebody else”. The usual workarounds are flags, a folder structure, or a separate to-do app you now keep in sync with your mail by hand.

FlowMail: the same mail as a Kanban board — To Do, In Progress, Done — with messages dragged between columns. A message keeps its board position as it syncs, so the board is a real working state rather than a view you rebuild each morning. It is the whole point of the app, so it is not something you have to pay to try.

4. Can it do the thing you do forty times a week?

Everybody has one. Find every invoice from this sender and label it. Draft the same reply for the fifth time. Move anything from that address straight to Done.

Check whether automation exists at all, then whether it can be triggered from outside the app — Shortcuts, Siri, Spotlight. That is the difference between a feature and something you will actually use.

FlowMail: workflows built from steps — find messages, apply or remove a label, move a card on the board, draft a reply, summarise, classify, fetch a web page, call a tool on your own MCP server. Run them from the app, from Siri, from Spotlight, or from a Shortcut, including on a message a Shortcut just found. Ten Shortcuts actions ship with it. One workflow on the free version; unlimited on Pro.

5. Where does the AI run, and who pays per message?

“AI email client” now covers at least three different arrangements. Some send your message to a cloud model on the vendor’s servers. Some ask you to bring your own API key, and you pay per message. Some run the model on your own machine.

The distinction is not only about privacy — it decides the pricing. An app paying a cloud provider per message has to meter you, and that is where usage caps and AI add-on tiers come from.

FlowMail: the AI steps use a language model running locally, on Apple’s MLX. You pick the model — from a 0.7 GB Llama up to a 2.4 GB Qwen — and it is downloaded once and then runs on your own hardware. No API key to supply, no metering, no usage cap; your mail is not sent to OpenAI, Anthropic, Google, or to us. It does need Apple Silicon: on an Intel Mac the rest of the app works and the AI steps do not. How the local AI works covers the four models and what still does leave your Mac.

6. Is there a server in the middle?

Some clients hold your mail connection on their own infrastructure rather than on your machine — it is close to unavoidable if an app wants to push notifications to a phone that is asleep, and on the desktop it is a design choice. It is a real trade rather than automatically wrong, but it is one you should make knowingly, because it means your messages pass through a company that is not your email provider.

FlowMail: mail is fetched from your provider straight to your Mac and stored there. red8.io runs no server that receives, stores or processes your messages, and there is no account to create with us. Sign-in tokens and app passwords live in the macOS Keychain. There is no analytics, no advertising and no crash reporting in the app. The FlowMail privacy policy has the full detail.

7. What does “free” mean in this particular app?

It ranges from a fourteen-day trial, to a version capped at two accounts, to a genuinely complete client. Find out which before you move your mail into it.

FlowMail: the free version is a complete email client — unlimited accounts, all your mailboxes, List and Kanban, search, live sync, notifications, every file format, one automation workflow, and the Summarize and Draft Reply steps. Pro adds the Graph view, unlimited workflows, and the Classify step that triages mail automatically. Monthly or yearly with a free trial, handled by Apple; prices are shown in the app in your local currency.

Where FlowMail does not fit

Four honest limits, because a page like this is worthless without them:

It is a Mac app only. There is no iPhone or iPad version. If you want one client across all your devices, this is not it.
It needs macOS 15.6 or later, and the local AI needs Apple Silicon.
It ships in English and Brazilian Portuguese, and nothing else yet.
The board only helps if you want to work that way. If your mail is a list you read and empty, a list is the right tool, and the one on your Mac is already doing it.

FlowMail is a free download on the Mac App Store, with an optional Pro subscription.