The Best Email Apps for iPhone 2021

Find the email app that's right for you

When the iPhone debuted in 2007, Apple included a built-in email app called Mail. No third-party mail apps were available at first, but email on the iPhone has come a long way since then. The App Store is awash in alternative email applications, so now the challenge is to find the best email app for your iPhone needs.

Check out this list to find the best email app for your iPhone.

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​Spark Mail

Spark Mail iOS app for iPhone
What We Like
  • Connect many types of email accounts.

  • Supports dark mode.

  • Smart notifications.

  • Customizable actions.

What We Don't Like
  • Some advanced features require a premium subscription.

  • No read receipts.

The designation "Best of the App Store" tells you a lot about the Spark Mail app. When you first open Spark, you are presented with an inbox grouped automatically by category. Spark is useful and a pleasure to use. You get one-tap replies, swiping actions (including an option to snooze email), and fast search results, which you can save as smart folders. Calendar integration lets you view your schedule and set up events from emails.

These capabilities, along with the best way to handle email signatures, make giving Spark a try worth it. Still, there is more to like. The customizable actions and push notifications for every email account are superior.

Spark supports IMAP and is available as a free download. Premium packages are available for enterprise environments.

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​iOS Mail

Apple's iOS Mail app for iPhone
What We Like
  • Comes bundled in iOS and is updated regularly.

  • Syncs automatically to Calendar.

  • Beginner-friendly but sufficient for most users.

  • Integrates with multiple email providers.

What We Don't Like
  • Lacks customization and advanced options.

Apple's free iOS Mail app is a reliable, solid email app for the iPhone. The Mail app offers simple solutions that are good for most needs. You can sort out VIP senders (which you define) and file emails to folders. Compose your emails using rich text and swipe to take action fast. Most importantly, you get beautifully rendered emails without clutter and almost no learning curve.

iOS Mail supports Exchange, IMAP, and POP.

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Microsoft Outlook

Microsoft Office Email app for iOS
What We Like
  • Feature-rich app.

  • Strong community for support.

  • Frequent updates.

  • Familiar interface.

What We Don't Like
  • Search results are too broad to be useful.

  • Not as user-friendly as the desktop Outlook.

  • Requires a Microsoft 365 subscription.

Outlook for iOS is fast. It lets you read, send, and file mail fast. While many email apps for iPhone feel sluggish even with these basics, Outlook for iOS progresses beyond them.

Outlook works with Microsoft Exchange, Microsoft 365,, Gmail, Yahoo Mail, and iCloud.

Search with near-instant results. For example, the intelligent inbox lets you see the most important emails first, and you can postpone emails with a simple swipe.

Outlook for iOS is the best email app for iPhone in an enterprise environment. It supports Exchange and IMAP accounts, although POP isn't supported.

Outlook for iOS comes with a calendar, which is simple but functional. However, task management isn't included. As on the desktop, you can extend functionality with add-ons, though.

Outlook for iOS supports Exchange and IMAP.

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Polymail app for iPhone
What We Like
  • One tap unsubscribe feature.

  • Customizable swipe actions.

  • Schedule when emails are read and sent.

What We Don't Like
  • Paid subscription after free trial for most features.

  • Doesn't work with password management tools.

  • Exchange is not supported.

Polymail comes with a host of features, from email and attachment tracking to scheduling delivery and message templates. If you can't tell already, Polymail is geared toward the professional with several tiers of pricing.

Polymail doesn't work with Exchange accounts directly yet and supports IMAP only.

No matter the edition and account, Polymail lets you postpone emails for later reading. This, like a few other often-used functions, is accessible using a swipe menu with actions you can customize. The Polymail inbox is always a plain list of emails sorted by date, though. You can filter it to show only unread emails, but it never organizes or groups itself.

Polymail supports IMAP.

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Airmail for iOS promotional images
What We Like
  • Sync across multiple devices.

  • Easy to configure interface.

  • Helpful technical support.

What We Don't Like
  • Email searches are clunky and inaccurate.

  • Requires paid subscription.

  • Unclear privacy policy.

Airmail does everything, it seems, and then some:

  • Turns emails into to-do items or adds them to the calendar.
  • Schedules an email to be sent later using Exchange and Gmail.
  • Organizes with folders and labels.
  • Blocks senders.
  • Offers an Undo Send feature.
  • Snoozes an email.
  • Picks actions available from new mail notifications.
  • Adds files from cloud storage as attachments.
  • Displays an email's full source code.
  • Locks your email.

While Airmail includes a smart, filtered inbox, its implementation isn't the most elegant, search is unstructured and not that smart, and Airmail could help more with smart email templates or text snippets.

Airmail supports IMAP and POP.

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Yahoo Mail

Yahoo Mail app for iPhone
What We Like
  • Works with different email accounts.

  • Interface is easy to customize.

  • Coupon feature, easy access to savings.

What We Don't Like
  • Security issues in the past.

  • Pay for premium features.

Names and titles can be deceiving at first. Yahoo Mail is for Yahoo Mail accounts—and for a few others, too (Gmail, What isn't deceiving about the Yahoo Mail app for iPhone is the friendly, simple face it presents at first.

Without confusing you with a multitude of options and actions, Yahoo Mail lets you star mail to highlight it, file it in folders, search fast, and filter your inbox by a handful of useful categories (including people, social updates, and those important travel emails). For sending email, Yahoo Mail shines with impressive image sending and attachment support as well as its unique and colorful email stationery.

Yahoo Mail supports Yahoo Mail, Gmail, and Outlook Online.

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Edison Mail

Three screens from Edison for iOS
What We Like
  • Easy unsubscribe feature for email.

  • Responsive in syncing.

  • Can mark emails as spam and block senders.

  • Simple user interface.

What We Don't Like
  • Occasional connection issues.

  • Collects some user data.

​The Edison Mail app isn't the digital assistant it claims to be, but it is a fantastic email program that gets the important things right.

First, the assistant claim: Edison Mail doesn't offer you the emails you need to see at any time without prompt, and it doesn't reply to messages on its own or suggest likely text to use. However, it does suggest recipients based on frequency and can filter and use emails by type—bills, booking, and shipment notifications as well as email subscriptions.

Edison Mail lets you find all messages fast (search is fast and useful), delete the whole bunch in an instant, and unsubscribe with a single tap. When you read newsletters and marketing emails, you can block read receipts. When you want to read later, Edison Mail offers convenient snoozing, and when you tap Send too fast, the app lets you undo it.

Edison Mail supports Exchange and IMAP.

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Twobird app for iPhone
What We Like
  • Combines email and to-do list functions.

  • Inbox connected to notes, reminders, and calendar.

  • Easy to read, attractive interface that supports dark mode.

What We Don't Like
  • Works with Gmail account only.

  • A relative newcomer that needs some polishing.

  • No built-in cloud storage.

It's easy to see where this app gets its name. Twobird can do more than one thing at a time. In addition to being an email app, it functions as a to-do list with note-taking capabilities and a calendar. The integration between notes and email in the app is particularly polished.

As a relatively new face in this crowd, Twobird has a few things it needs to add in the future. Currently, it works only with Gmail accounts, and it doesn't have built-in cloud storage. Once these hurdles are surpassed, Twobird will be a strong contender among email apps for the iPhone.

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