Mail User Guide

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You can create rules that help you manage incoming email messages and automate tasks, such as replying to or deleting messages. For example, you can create a rule that highlights messages from a specific person, or that automatically moves messages from your inbox to other mailboxes.

In the Mail app on your Mac, choose Mail > Preferences, then click Rules.
To review an example of a rule, select a provided rule, then click Edit. To close the rule, click Cancel.
Click Add Rule, then type a name for the rule.
Indicate whether any or all of the conditions must be true for the rule to be applied to a message.
Specify the conditions.
To use different header fields in conditions, choose “Edit header list” from the bottom of the first pop-up menu. To add your own header, click the Add button in the Message Headers window.
Choose actions to perform on messages that meet the conditions. To specify multiple actions, click the Add button .
You can use AppleScript scripts as rule actions.
When you’re done, click OK, then decide to apply rules to existing messages already in mailboxes or to new messages.
You can apply rules to existing messages later by choosing Message > Apply Rules.

If you have multiple rules, they’re applied in the order in which they appear in the list of rules; drag a rule up or down to change the order.

Mail stops applying rules to a message when it encounters the Stop Evaluating Rules action, or when a message is transferred to another mailbox by rules used on a mail server or computer or device synced to your computer.

If you use iCloud Drive, your rules are available on your other Mac computers that have iCloud Drive turned on and Mail selected in in iCloud Drive options. Files attached to rules, such as sound files or scripts, aren’t available. See Use iCloud Drive to store documents.

See alsoColor-code emails in Mail on MacUse Smart Mailboxes in Mail on MacReply to, forward, or redirect emails in Mail on Mac

Apps are the most common type of Mac software, but there are many other types of software that you can create, too. The following sections introduce the range of software products you can create for the Mac platform and suggest when you might consider doing so.

Apps

Apps are by far the predominant type of software created for Mac, or for any platform. You use Cocoa to build new Mac apps. To learn more about the features and frameworks available in Cocoa, see Cocoa Application Layer.

In general, there are three basic styles of Mac apps:

The single-window utility app. A single-window utility app helps users perform the primary task within one window. Although a single-window utility app might also open an additional window—such as a preferences window—the user remains focused on the main window. Calculator is an example of a single-window utility app.
The single-window “shoebox” app. The defining characteristic of a shoebox app is the way it gives users an app-specific view of their content. For example, iPhoto users don’t find or organize their photos in the Finder; instead, they manage their photo collections entirely within the app.
The multiwindow document-based app. A multiwindow document-based app, such as Pages, opens a new window for each document the user creates or views. This style of app does not need a main window (although it might open a preferences or other auxiliary window).

App Extensions

No matter what type of app you write, you use app extensions to extend the functionality and content of that app to other parts of the system, or even to other apps. Types of extensions include:

Today. Display information from your app, or perform a quick task in the Today view of Notification Center.
Share. Share information with others by posting information to a website or social service, or sending data out in some other way.
Action. Create a context allowing the user to manipulate or view items from your app inside another app.
Finder. Show the sync state information in Finder.

App Store

Regardless of the app style you choose, your goal is probably to get your app into the Mac App Store. The development process that helps you achieve this goal includes a mix of coding and administrative tasks.

This document gives you an overview of Mac technologies that you can incorporate into your app. To learn more about the other tasks involved in the development process, read App Distribution Quick Start.

Development Languages

The tools for OS X supports many different development languages. In addition to Swift, Objective-C, C++, C, and other such languages, Xcode provides support for many scripting languages. For more information, see Scripts below.

The most common languages used for development for OS X are Swift and Objective-C. The following sections call out key features in some of these environments.

Swift

Swift is a new programming language for Cocoa and Cocoa Touch with a concise and expressive syntax. Swift incorporates research on programming language combined with decades of experience building Apple platforms. Code written in Swift co-exists with existing classes written in Objective-C, allowing for easy adoption.

Some of the key features of Swift are:

Closures unified with function pointers
First class functions
Tuples and multiple return values
Generics
Fast and concise iteration over a range or collection
Structs and Enums that support methods, extensions, and protocols
Functional programming patterns
Type safety and type inference with restricted access to direct pointers

Swift also supports the use of Playgrounds, an interactive environment for real time evaluation of code. Use playgrounds for designing a new algorithm, creating and verifying new tests, or learning about the language and APIs.

To learn more about Swift, see The Swift Programming Language, or for a quick overview, see Welcome to Swift.

Objective-C

Objective-C is a C-based programming language with object-oriented extensions. It is a primary development language for Cocoa apps. Unlike C++ and some other object-oriented languages, Objective-C comes with its own dynamic runtime environment. This runtime environment makes it much easier to extend the behavior of code at runtime without having access to the original source.

Objective-C 2.0 supports the following features, among many others:

Blocks (which are described in Block Objects)
Declared properties, which offer a simple way to declare and implement an object’s accessor methods
A for operator syntax for performing f

Additional Stationary For Mac Mail