The old Stationery function is gone in macOS Mojave, but you can still create email templates you can easily access. The trick is to build draft email messages and then move them to a custom mailbox. Then you can grab one of those messages and send it, customizing it as you see fit. In addition, you can use Pages instead of Mail to compose your templates as some features like tables are only available this way.
You can create contacts, set up calendar events, and get intel on pieces of text in incoming email, web pages and other documents using Data Detectors and Look Up. This feature of macOS will figure out what information represents, such as a location or appointment time, or business name or person, and allow you to act on it.
Email signatures are easy to set up so that you can have your name and other information automatically displayed at the bottom of any email you compose. You can also add multiple email signatures and assign them to different email accounts. You can set a signature to use as your default, or change your signature each time you compose a new message.
You can create up to 3 extra email addresses in your iCloud account that you can use to mask your real email address. These extra addresses will direct email to your regular iCloud account, but the sender doesn't know what your real email address is. These are handy for creating one-time use accounts or using a different email address for certain types of services like online games, shopping or newsletters.
If you need to save an important email as a document rather than simply marking it in the Mail app, you can export a message in four different ways. You can save it as plain text, rich text, or as a raw .eml file. The latter is useful for seeing the message in Mail as it was original displayed. You can also export as a PDF file to insure that the message looks good and remains unchanged even after online images no longer exist.
You can do more with Mac dictation than just typing text. You can use commands to control your Mac. You can select menu items, interface buttons and move between fields in the interface. In this example, I'll start, address, compose and send an email message without even touching the keyboard or mouse.
For each account you have set up in Mail Mail, you have the ability to set mailbox behaviors. These determine where messages are stored. You can set the destination for sent email, drafts, junk, deleted and archived messages. Your options will depend on your email service. When possible set these to use the cloud-based options so that the messages are seen across all of your devices.
Forwarding email is a quick way to send along an email you received to someone else. But it also means that when that person responds, the response will come to you, not the original sender. You can use Mac Mail's Redirect command to send the message to someone else and retain the sender in the From field so that replies will skip you and go directly back to the original sender. This is useful when you need to send along a question to someone else to answer it.
There is a quick and easy way to see your document or selected word count in Pages. In TextEdit, there is a simple trick you can use to reveal the document word count. You can also write a simple two-line AppleScript service in Automator to count the words in selected text in almost any application on your Mac.
There are several ways to attach an image to an email message. You can place the image anywhere you want in the message, or at the end. You can choose a size for the image, sending a smaller version or the full resolution image. You can also markup an image before sending it.
You can customize the toolbar in the Finder and many apps. You can add buttons, spaces and other controls. Some apps have a large selection of buttons you can add. You can also revert to the default set easily. See what is available in the Finder, Mail, Pages and other apps.
One formatting option missing in Mac mail is the ability to highlight text by adding a background color to a text selection. This is useful when you want to point out a passage in a response and is commonly using in Windows email clients. While there is no way to do it with standard text styling in Mail, you can create a custom style by copying and pasting an example from Pages, creating a style, and then applying that style later on in other messages.
When you type and email address in Mail, you will get some suggestions that include your Contacts and also a list of previous recipients. Some of these addresses may be old or ones you don't wish to see anymore. You can delete them using the Previous Recipients list in Mail.
You can use your own sounds for alerts in macOS Sierra and Mail. You'll need to convert the sounds to AIF format and put them in the Library folder. Then these custom sounds will show up after restarting System Preferences or Mail.
With Mac Mail you can view individual messages or group them together in conversations. Which you use is a personal preference. With conversations you can view all of the messages sent back and forth between two or more people about a single subject. This makes following responses easier.
You can sign PDF documents in the Preview app and in Mail. You save your signature using either the trackpad or your Mac's camera. You can then insert that signature in any spot in the PDF. It then becomes a permanent part of that PDF just as if you had printed out the document, signed it, and then scanned it back in. You can do the same in Mail, but only the copy sent will contain the signature.
In addition to sending email 'to' someone, you can also include additional email addresses in the CD and BCC fields. CC is a way to send copies of your messages to people that need to know the information, but don't need to respond. BCC is a good way to send messages to people without sharing their email address with others.
Mail in El Capitan allows you to easily work with multiple messages in full screen mode. You can minimize the composition window and return to it. You can also put multiple messages into the composition window and select them using the titles of the messages at the top.
A new feature of Mail in El Capitan is the ability to swipe across a message using your Mac's trackpad to access some common functions. This is similar to how Mail in iOS works. You can mark a message as Read or Unread, or delete it. You can also change the delete option to archive. This even works for messages not currently selected.
When you compose a new message in Mail, you are usually spending a very short amount of time in the Mail composition window and it is easy to miss some of the features. At the top of the window you can use various buttons and add more. You can also change the fields available to you, such as adding or removing CC and BCC fields and even a REPLY-TO field. In the message body area, you can use styling and also mark up images and PDFs.