|Operating system||macOS, iOS, watchOS, and iPadOS|
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Apple Mail (officially known as simply Mail) is an email client included by Apple Inc. with its operating systems macOS, iOS and watchOS. Apple Mail grew out of NeXTMail, which was originally developed by NeXT as part of its NeXTSTEP operating system, after Apple's acquisition of NeXT in 1997.
The current version of Apple Mail utilizes SMTP for message sending, POP3, Exchange and IMAP for message retrieval and S/MIME for end-to-end message encryption. It is also preconfigured to work with popular email providers, such as Yahoo! Mail, AOL Mail, Gmail, Outlook and iCloud (formerly MobileMe) and it supports Exchange. iOS features a mobile version of Apple Mail with added Exchange ActiveSync (EAS) support, though it notoriously missed the functionality of attaching files to reply emails until the release of iOS 9. EAS is not supported in the macOS version of Apple's Mail app, the main issue being that sent messages will incorrectly be duplicated in the sent messages folder, which then propagates via sync to all other devices including iOS.
Features of Apple Mail include the ability to configure the software to receive all of a user's email accounts in the one list, ability to file emails into folders, ability to search for emails, and ability to automatically append signatures to outgoing emails. It also integrates with the Contacts list, Calendar, Maps and other apps.
Apple Mail was originally developed by NeXT as NeXTMail, the email application for its NeXTSTEP operating system. It supported rich text formatting with images and voice messaging, and MIME emails. It also supported plain text (TUI) to allow for backwards compatibility.
When Apple began to adapt NeXTSTEP to become Mac OS X, both the operating system and the application went through various stages as it was developed. In a beta version (codenamed "Rhapsody") and various other early pre-releases of Mac OS X, Mail was known as MailViewer. However, with the third developer release of Mac OS X, the application had returned to being known simply as Mail.
Apple Mail was included in all versions of macOS up to and including Mac OS X Panther, which was released on October 24, 2003. It was integrated with other Apple applications such as Address Book, iChat, and iCal. Some of its features that remain in the most recent version of Mail include rules for mailboxes, junk mail filtering and multiple account management.
The new version also changed the UI for the buttons in the toolbar. Whereas previous buttons had free-standing defined shapes, the new buttons featured shapes within a lozenge-shaped capsule. According to many users, and even Apple's own human interface guidelines at the time, this was worse for usability. An open-source third-party application that reverted the icons to their former shapes was available. Nevertheless, Apple updated their guidelines to include capsule-shaped buttons, and the new UI persisted.
In Mac OS X Leopard (version 10.5), Mail version 3 included personalized stationery, handled in standard HTML format. In addition, it offered notes and to-dos (which could be synced with iCal) as well as a built-in RSS reader. It also introduced IMAP IDLE support for account inboxes.
In Mac OS X Lion (version 10.7), Mail featured a redesigned iPad-like user interface with full-screen capabilities, an updated message search interface, support for Microsoft Exchange Server 2010 and Yahoo! Mail (via IMAP). Also added was the capability to group messages by subject in a similar fashion to Mail on iOS 4. The bounce function, where unwanted emails could be bounced back to the sender, was dropped, as was support for Exchange push email.
In OS X Mountain Lion (version 10.8), Mail received VIP tagging, Safari-style inline search for words within an email message, the ability to sync with iCloud and new sharing features. Notes was split off into a stand-alone application. The RSS reader and to-dos were discontinued.
In OS X Mavericks (version 10.9), Mail ceased support for plain-text MIME multipart/alternative messages and solely retained the HTML or rich-text version.
In OS X Yosemite (version 10.10), Mail introduced Markup (inline annotation of PDF or image files) and Mail Drop (automatically uploads attachments to iCloud, and sends a link in the message instead of the whole file).
In OS X El Capitan (version 10.11), a filter was added to the message list to filter by various options such as Unread, Flagged, or messages with attachments. The conversation display was also redesigned and various disk space saving optimizations were implemented. Streaming notification support for Exchange accounts was also added.
Support for macOS's new "dark mode" was added to Mail.
Added support for Block Sender, Unsubscribe, Mute Thread and layout options.
In macOS Big Sur, the Mail logo was changed to be more consistent with the iOS version, depicting a white envelope on a blue background.