Re-index to fix the Mac Mail folders disappeared problem. If the Email accounts are working, but the mailboxes have disappeared, the second method will probably be of little help. That being said, you can still try it out. On the Apple discussions forum, there are a number of threads about Mac Mail mailboxes disappearing. Dec 28, 2018  Mail icon, is gone from the start menu. But the microsoft store icon is gone on the task bar but if you click on where it was, the microsoft store opens and my garmin express icon has been replace by a document page but will open garmin express. So in order for me to access my email, i had to open up outlook and pin it on my browser bar.

Add your email account

If you don't have an email account set up, Mail prompts you to add your email account.

To add another account, choose Mail > Add Account from the menu bar in Mail. Or choose Apple menu  > System Preferences, click Internet Accounts, then click the type of account to add.

• When adding an account, if you get a message that your account provider requires completing authentication in Safari, click Open Safari and follow the sign-in instructions in the Safari window.
• If necessary, Mail might ask you for additional settings.

Learn more about how to add or remove email accounts.

Send and reply

Learn how to compose, reply to, and forward email.

Send new messages

1. Click New Message in the Mail toolbar, or choose File > New Message.
2. Enter a name, email address, or group name in the 'To' field. Mail gives suggestions based on your contacts and messages on your Mac and devices signed into iCloud.¹
3. Enter a subject for your message.
4. Write your email in the body of the message.
   • To add an attachment, drag an attachment to the body of the message. Or choose File > Attach Files, choose an attachment, then click Choose.
   • To change your font and format, use the options at the top of the message window.
   • Beginning with macOS Mojave, it's even easier to add emoji to your messages. Just click the Emoji & Symbols button in the toolbar at the top of the message window, then choose emoji or other symbols from the character viewer.
5. Send or save your message:
   • To send, click the Send button or choose Message > Send.
   • To save your message as a draft for later, close the message, then click Save.

Reply and forward

• To reply to a single person, click Reply , type your response, then click Send .

• To reply to everyone on a group email, click Reply All , type your response, then click Send .

• To forward a message to other people, click Forward , type your response, then click Send .

Organize and search

Sort your emails into folders and use multiple search options to find specific messages.

Create folders

You can create Mailboxes to organize your emails into folders.

1. Open Mail, then choose Mailbox > New Mailbox from the menu bar.
2. In the dialog that appears, choose the location for the Mailbox.
   • Choose your email service (like iCloud) to access your Mailbox on your other devices, such as an iPhone signed into the same email account.
   • Choose On My Mac to access your Mailbox only on your Mac.
3. Name the mailbox and click OK.

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If you don't see the mailboxes sidebar, choose View > Show Mailbox List. To show or hide mailboxes from an email account, move your pointer over a section in the sidebar and click Show or Hide.

Sort your emails

To move a message from your Inbox to a mailbox:

• Drag the message onto a mailbox in the sidebar.
• In macOS Mojave, you can select the message, then click Move in the Mail toolbar to file the message into the suggested mailbox. Mail makes mailbox suggestions based on where you've filed similar messages in the past, so suggestions get better the more you file your messages.
  

To delete a message, select a message, then press the Delete key.

To automatically move messages to specific mailboxes, use rules.

Search

Use the Search field in the Mail window to search by sender, subject, attachments, and more. To narrow your search, choose an option from the menu that appears as you type.

Add and mark up attachments

Attach documents and files to your messages and use Markup to annotate, add your signature, and more.

Attach a file

To attach a file to your message:

• Drag an attachment to the body of the message.
• Choose File > Attach Files, choose an attachment, then click Choose.

Use Markup with your attachments

You can use Markup to draw and type directly on an attachment, like an image or PDF document.²

1. Click the Attach button or choose File > Attach Files in the message window.
2. Choose an attachment, then click Choose File.
3. Click the menu icon that appears in the upper-right corner of the attachment, then choose Markup.
   • Use the Sketch tool to create freehand drawings.
   • Use the Shapes tool to add shapes like rectangles, ovals, lines, and arrows.
   • Use the Zoom tool in the Shapes menu to magnify and call attention to a part of an attachment.
   • Use the Text tool to add text.
   • Use the Sign tool to add your signature.
4. Click Done.

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Learn more

• Contact Apple Support.

1. All devices signed into iCloud with the same Apple ID share contacts. Contacts addressed in previous messages that were sent and received on those devices are also included. To control this feature, turn Contacts on or off for iCloud. On Mac, choose Apple menu  > System Preferences, then click iCloud. On iOS devices, go to Settings, tap your name at the top of the screen, then tap iCloud.

2. Markup is available in OS X Yosemite and later.

I’ve been bothered with this issue for several times. I can’t shut down my Mac because of Mail, an app I use daily.

It seems Mail won’t quit and it shows me this error message:

I remember I quit the Apple Mail app, but somehow it just failed…weird!

After attempting to research the reasons why, I also bumped into a few forum discussions where other Mac users were also experiencing the same issue.

And to my surprise, we can’t figure out the exact reasons. Some say it’s related to the OS X (now macOS) your Mac is running under, while there are also people say it’s due to the Mail app itself — meaning it’s a bug that needs to be fixed.

Personally, I feel the later sounds more reasonable. Because I’ve encountered a few other issues related to Mail, such as the app takes longer to receive and send out new mails. Especially when I send an email, sometimes it just freezes on the “sending” process, I often have to double check the sendbox to make sure my email reply is delivered successfully. Apple already knows this issue as you can see from this support article.

Another case, which is more recent — the Mail app has some problems after iPhone and iPad users updated to iOS 11. Apple and Microsoft ware working together to fix the problems, as you can read more from this MacRumor report.

Anyways, the solution to fix that Mail failing to quit error is also simple.

Simply click the Apple logo on the top left corner, then select Force Quit, highlight the Mail app, and confirm the operation. After that, your Mac should be able to shut down properly.

Another way to do this is open Activity Monitor (do a quick Spotlight search? to open the app), then select the Mail related process and quit it.

My Mac Mail App Icon Disappeared Iphone

You can choose either way to get that done.

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That’s for this update, I hope you find it useful. And hopefully Apple Mail team would improve the app and make it more smooth to use 🙂