The best email client for Mac in 2026
Updated October 2026
The best email client for your Mac depends on your accounts and on what you want from it. Apple Mail is free and handles every account. Mimestream has the most Gmail features, and Spark and Canary add AI features and a unified inbox. If you want a mail app that looks and feels like yours, Lambda Mail is built around that: seven themes to start and as many of your own as you like, with every color for light and dark, four fonts, three densities, text size and a see-through sidebar, and nothing to code.
Quick picks
- To make it yours: Lambda Mail, for Gmail, with as many themes of your own as you like. eM Client, on Mac and Windows, also has a theme editor.
- Free, for every account: Apple Mail.
- The most Gmail features: Mimestream.
- AI features and a unified inbox: Spark or Canary.
- Microsoft accounts: Outlook for Mac.
- Free and open source: Thunderbird.
- Keyboard, rules and plain text: MailMate.
The apps at a glance
| App | Best for | Price, October 2026 | Accounts | Themes |
|---|---|---|---|---|
| Lambda Mail | Gmail that looks and feels your way, with no servers and no AI | Free during the beta | Gmail and Google Workspace | 7, plus as many of your own as you like |
| Apple Mail | Every account in one free app | Free with every Mac | Any | None, light and dark follow macOS |
| Mimestream | The most Gmail features in a native app | $49.99 a year or $4.99 a month | Gmail and Google Workspace | None, four list styles |
| Spark | AI and teams, on every platform | Free; Plus $99 a year; Pro $199 a year | Most providers | None, light and dark |
| Canary | Spark's kind of features with a free plan | Free; Growth $36 a year; Pro+ $100 a year | Most providers | None, light and dark |
| Airmail | Lots of layouts and actions to tune | Free with one account; Pro $49.99 a year | Most providers | 7 |
| Outlook for Mac | Microsoft accounts | Free | Most providers | A small set |
| eM Client | Themes, mail and calendar on Mac and Windows | Free for two accounts; Personal €24.95 a year | Most providers | 17, an editor and a gallery |
| Thunderbird | Free and open source | Free | Most providers | Through add-ons |
| MailMate | Keyboard, rules and plain text | $10 every three months | IMAP accounts | None, styles by editing files |
| Mailspring | Free, on Mac, Windows and Linux | Free; Pro $8 a month | Most providers | A few, more written in code |
Prices from each app's pricing page or Mac App Store listing, read October 29, 2026. eM Client lists its prices in euros.
How far each app lets you make it yours
Most “best of” lists stop at a line about customization. Here's what each app's own help pages say you can change.
| Lambda Mail | eM Client | Airmail | Apple Mail | Mimestream | Spark | Canary | |
|---|---|---|---|---|---|---|---|
| Themes | 7 to start, and as many of your own as you like | 17, and your own | 7 | Not found | Not found | Not found | Not found |
| Make your own theme | Yes, right in Settings | Yes, in its Theme Editor | Not found | Not found | Not found | Not found | Not found |
| Your own colors | All 10, from the sidebar to the unread dot | Yes, in a theme editor | Account colors | Quote colors | Label and account colors | Account colors | Account colors |
| Separate light and dark colors | Yes, in every theme | Not found | Not found | Not found | Not found | Not found | Not found |
| Font | System, Rounded, Serif or Monospaced | List fonts | Not found | Any font, for the list and messages | Not found | Not found | Not found |
| Spacing | Compact, Regular or Roomy | Compact or single-line list | Layouts | Preview lines | Four list styles | Preview lines | Preview lines |
| Text size | 85% to 140% | Not found | Not found | Yes | Seven sizes | Zoom | Yes |
| See-through sidebar | Yes, with a tint you set | Not found | Not found | Liquid Glass, set in macOS | Liquid Glass | Not found | Not found |
| Share themes | Export and import files | Files and a gallery | Not found | Not found | Not found | Not found | Not found |
From each app's help pages and settings guides, read October 2026. “Not found” means we didn't find it there, not that it can't exist. Lambda Mail's see-through sidebar needs macOS 26 or later.
Three more apps go further if you write code. Thunderbird takes themes from its add-on site and changes in CSS, Mailspring themes are written in LESS, and MailMate's message view is styled by editing its files. Many lists call Airmail the most customizable: it has seven themes and lets you rearrange its toolbar, sidebar and panels, but its help pages mention no way to pick your own colors.
Lambda Mail: calm by default, yours all the way
We make Lambda Mail, a Gmail app for Mac. It opens looking like a Mac app should: calm, native, nothing to set up. Everything after that is up to you, from one new accent color to a theme no one else has.
SystemThe Mac's own colors
GraphiteCool grays, violet accent
PaperWarm paper, rust accent
MidnightDeep navy, bright blue
ForestSoft greens
RoséBlush and pink
TerminalGreen on black, after dark
YoursDuplicate any theme and change it
- Themes: System, Graphite, Paper, Midnight, Forest, Rosé and Terminal to start, each with its own light and dark colors that switch with your Mac. Duplicate any of them and make as many of your own as you like.
- Every color: sidebar, message list, reading pane, message cards, compose window, text, secondary text, accent, unread dot and attachment cards, each with transparency if you like, and a Reset back to the Mac's own color.
- Font and spacing: System, Rounded, Serif or Monospaced, with Compact, Regular or Roomy rows.
- Text size: 85% to 140% for the list and the emails on your screen. The mail you send keeps its usual size.
- Liquid Glass sidebar: on macOS 26 and later, let your desktop show through the sidebar, with a Tint slider from clear glass to your theme's solid color.
- Dark mode, your way: choose whether HTML emails stay on white paper.
- Your sidebar: hide the mailboxes you don't use, drag the rest into your own order, and give each label any color.
- Sharing: export a theme as a file and import other people's. Community themes, to share yours and try other people's, are on the roadmap for spring 2027.
Try it on our home page: the window there changes as you pick a font, a density, a text size or a color.
And everything else it does
- Attachments at the bottom: files stay in a bar under the message when you read, and in a tray below your text when you write, never between your lines.
- Gmail as Gmail: labels, an Archive that works like Gmail's, Gmail's search, and several accounts, each with its own mailboxes and signature.
- A real Mac app: the Mac's menus, shortcuts, Quick Look and notifications.
- No servers and no AI: your mail goes from Google to your Mac, your login stays in your Keychain, and there's no Lambda account to create.
What it doesn't do yet: it works with Gmail and Google Workspace only, with iCloud and Outlook on the roadmap, and it has no unified inbox, snooze, send later or templates. It's a beta, and the beta is free.
The other apps, in brief
- Apple Mail: free, every account, send later and undo send built in. Its look follows macOS, and Gmail's labels show up as folders. See Apple Mail and Gmail.
- Mimestream: a native Gmail app built on Gmail's API, with filters, snooze, undo send and templates. Subscription only. See Mimestream alternatives.
- Spark: a unified inbox, a Smart Inbox, snooze and send later on every platform, with AI and team features in the paid plans. Some features run on its servers. See Spark alternatives.
- Canary: close to Spark, with a unified inbox, snooze and templates on its free plan.
- Airmail: seven themes and many ways to arrange its panels, toolbar and actions.
- Outlook for Mac: free, at home with Microsoft accounts. It syncs other accounts through Microsoft's cloud unless you choose otherwise.
- eM Client: 17 themes, a theme editor and a gallery of themes made by users, with mail and calendar on Mac and Windows.
- Thunderbird: free and open source, with add-ons and themes for nearly everything.
- MailMate: for keyboard users who like rules, smart mailboxes and plain text.
- Mailspring: free and open source on Mac, Windows and Linux, with themes you can write yourself.
Where each app keeps your mail is its own question: see Which Mac email apps keep your mail on their servers?
How we compared
We make Lambda Mail, so read this as our side of the story, kept to facts. Every claim about another app comes from its own help pages, pricing page or Mac App Store listing, read in October 2026, and every one is linked below. Apps change, so check before you decide.
More guides
Sources, read October 2026: Apple, Fonts & Colors and Viewing settings in Mail and Send email messages; Mimestream, pricing, list style, general settings and release notes; Spark, pricing, personalization and reading font; Canary, pricing and macOS preferences; Airmail, themes, appearance and its Mac App Store listing; Microsoft, change the look and feel and Outlook for Mac and Microsoft Cloud; eM Client, themes, themes gallery, customizing the interface (2020) and pricing; Thunderbird; MailMate, pricing and customization; Mailspring, home page and theme starter.