The best email client for Mac

How to choose one in 2026 — updated October 2026

There is no single best mail app for a Mac, only the best one for the mail you have. Someone with one Gmail address wants something different from someone with three Exchange mailboxes and a drawer of old Outlook archives. This page sorts the main Mac email clients by what they are good at, so you can skip straight to the two or three worth trying.

The short answer

If you want…	Start with
Something free that is already installed	Apple Mail
A free, open-source client with lots of settings	Thunderbird
The same app your company uses on Windows	Outlook for Mac
Only Gmail, done the Gmail way	Mimestream
A smart inbox and shared team inboxes	Spark
Keyboard-driven power-user IMAP	MailMate
One search across every account and years of old mail, kept on your own disk	MailCode

What actually matters when you choose

Most comparisons list features. These are the six questions that decide whether a mail client still suits you a year later.

1. Which accounts does it speak?

Gmail, iCloud and most providers use IMAP, and almost every client handles them. Exchange and Microsoft 365 are where clients differ: some connect natively, some only over IMAP, and some not at all. If work mail is on Exchange, check this first.

2. Can you search everything at once?

A unified inbox is common. A single search across every account, every folder and every year is not. Many clients search only what they have downloaded recently, or only one account at a time.

3. Where does your mail live?

Some clients are a window onto the server and keep only a cache. Others keep a full local copy you can search offline and keep after the server deletes it. This matters as soon as a mailbox fills up or a job ends.

4. Does a third party sit in the middle?

Some modern clients run features such as push notifications, send-later or AI through their own servers, which means your credentials or message content pass through them. Others talk to your mail server directly. Neither is wrong, but you should know which you are choosing.

5. Can it open the mail you already have?

Old Outlook .pst files, .msg attachments, .eml folders and mbox exports from another client. Most Mac apps read some of these. Few read all of them.

6. Subscription or one-time?

Mail clients are priced in every way: free, free with paid tiers, yearly subscriptions and one-time purchases. Over five years the difference adds up.

The main Mac email clients

Apple Mail

Free, built in, and well integrated with macOS: iCloud, Contacts, Calendar, Handoff and Spotlight. For one or two personal accounts it is hard to beat on effort. The usual complaints are search, which leans on Spotlight's index and is unreliable on large mailboxes, limited rules, and no way to open Outlook data files.

Good fit: personal IMAP or iCloud mail, people who want zero setup.

Outlook for Mac

Microsoft's own client, now free to use for most accounts, with the full feature set for Microsoft 365. It is the natural choice when your company runs on Microsoft 365 and IT supports Outlook. The current "new Outlook" works mostly online, so offline search over years of mail and local archiving are not its strength.

Good fit: Microsoft 365 workplaces, people who want the same app as their Windows colleagues.

Thunderbird

Free and open source, from the Mozilla project, with a long history and a large add-on library. It keeps mail locally in mbox files, has deep settings for filters and folders, and since late 2025 connects to Exchange mail natively instead of needing a paid add-on. On a Mac it looks and feels less native than the alternatives.

Good fit: people who want free and open source and do not mind tuning settings.

Mimestream

A native Mac client built only for Gmail, using Gmail's own API, so labels, categories and filters behave exactly as they do on the web. Sold as a subscription. If every account you have is Gmail, it is one of the most polished choices. If any account is not Gmail, it cannot help.

Good fit: Gmail and Google Workspace only.

Spark

Readdle's client for Mac, iPhone, iPad, Windows and Android, known for its smart inbox, shared team inboxes and AI writing tools. Several features, push notifications among them, run through Readdle's servers, which is what makes them work across devices. There is a free tier with paid plans for teams and extra features.

Good fit: teams that share inboxes, people who want the same app on every device.

MailMate

A keyboard-driven IMAP client for people who care about standards, Markdown composing and powerful smart mailboxes. Plain to look at, very capable underneath. IMAP only, so Exchange works only if the server also offers IMAP.

Good fit: power users on IMAP who live on the keyboard.

MailCode

Our app. It connects to Exchange (EWS), Microsoft 365, Gmail and any IMAP account, and keeps every message in a full-text index on your own disk. One search runs across every account and every imported archive at once, and answers in 4–48 ms on a real 285,978-message archive. It also opens what other Mac clients cannot: Outlook .pst and .ost files, .msg files, .eml folders and mbox exports, with the folder tree intact. When a server mailbox fills up, it moves old mail onto your disk and keeps it searchable. There is no MailCode server in the middle. Free 14-day trial, then a one-time purchase on the Mac App Store.

Not a good fit if you need a phone app (MailCode is desktop only), shared team inboxes or built-in chat, or the simplest possible app for one personal account. Apple Mail will serve that last case better, for free.

Good fit: several accounts, years of mail, Exchange at work, old Outlook archives to open.

Side by side

	Exchange / M365	Search all accounts at once	Full local copy	Opens .pst	Price model
Apple Mail	Yes	Partly	Yes	No	Free
Outlook for Mac	Yes	Yes	Partly	Partly	Free / Microsoft 365
Thunderbird	Mail, yes	Yes	Yes	No	Free
Mimestream	No	Gmail only	Partly	No	Subscription
Spark	Yes	Partly	No	No	Free + paid plans
MailMate	IMAP only	Yes	Yes	No	One-time
MailCode	Yes	Yes	Yes	Yes	One-time

"Partly" means it depends on the version, settings or account type. Features change; check each app's own site before you decide.

How to test a mail client in one afternoon

A feature list will not tell you whether a client suits you. An afternoon with your own mail will.

1. Add every account you actually use, work included. A client that cannot add one of them is out.
2. Search for something old that you know exists: a contract from three years ago, an invoice number, a phone number. Time it. Then search for something in a different account.
3. Turn off Wi-Fi and search again. This shows whether the mail is on your Mac or only on the server.
4. Open the oldest file you have: a .pst, a .msg attachment, a folder of .eml files.
5. Write and send a real reply with an attachment and your signature, and check how it looks on the other end.
6. Read the privacy page and find out whether your mail or password passes through the vendor's servers.

Keep the old client installed until the new one has passed all six. Moving your existing mail across is covered in switching from another mail client.

Questions people ask

What is the best free email client for Mac?

Apple Mail if you want the simplest option, already installed. Thunderbird if you want free and open source with more settings and Exchange mail support.

What is the best email client for Mac with multiple accounts?

Most clients show several accounts in one inbox. Fewer search them all at once, including older mail. MailCode, Thunderbird and MailMate search across accounts. MailCode also includes imported archives in the same search.

What is the best email client for Gmail on Mac?

Mimestream, if every account is Gmail. It uses Gmail's own labels and filters. If you also have non-Gmail accounts, pick a client that handles all of them.

What is the best Mac email client for Exchange or Outlook accounts?

Outlook for Mac if your company standardises on it. MailCode if you want Exchange alongside IMAP accounts, local archiving and fast offline search. Apple Mail and Thunderbird also connect to Exchange mail.

Is Apple Mail good enough?

For one or two personal accounts, often yes. People usually move when search stops finding things, when a mailbox fills up, or when they need to open Outlook files.

Can a Mac email client open Outlook PST files?

Most cannot. MailCode opens .pst and .ost files directly, without Outlook, and keeps the folder tree. See how to open a PST file on a Mac.

Do I need a subscription for a good Mac email client?

No. Apple Mail and Thunderbird are free, and MailMate and MailCode are one-time purchases. Subscriptions are common among newer clients such as Mimestream and paid Spark plans.