Jan 05, 2019 On a Mac, you can use the software through a browser as it was initially designed, or through the native Mail app. Another alternative is to bring the look and feel of the web-based Gmail to the desktop through a third-party app solution. Restart your macOS Catalina and relaunch the Mail app. Click on the Mail option, then click on Add Account, choose an account type and enter the account information. Now, enable the Mail option for the account by checking the mail checkbox. Close the Mail app and relaunch it. Mar 17, 2020 The issue appears to be a problem with Apple Mail itself, and not with Google or your Gmail account. This means you can have a working mail client — and possibly one with a far richer feature set — by replacing Apple Mail with a third-party alternative.
Several people are experiencing issues with Gmail (especially G Suite) email accounts in Mail on Mac. It seems that the Mail App is not working as expected for some Gmail users. More specifically, some Gmail users have said that after installing the macOS 10.14.4, and launching the Mail app, some Gmail users are asked to authenticate their email addresses. They get a notification saying:

See also: macOS Mojave Freezes or Stops Responding, Fix
“Enter the password for the account “(null)”: Google requires completing authentication in Safari.” This takes users to a Google web login form. However, shortly after authenticating, the Mail app asks for authentication once again, and again, as the process does not stick and goes into an endless loop.
Please note that we contacted Apple regarding this issue, and we were told that Apple is currently working on a fix.
In the meantime, you can try the following fixes:
1– Changing your Gmail account’s security settings may fix this problem. Open Google’s My Account site (https://myaccount.google.com) and click Security (On the left navigation panel) and then scroll down and find the “Less secure app access” section and turn this on (note that Google recommends this OFF).
See also: Mail App Keeps Crashing
2- Set up your email account using IMAP. Please note that this process will delete your messages and will no longer available on your Mac. But do not worry, your mails will not be removed from Google’s servers, you can still access your mails via gmail.com web site. Here is how:
- Open the Mail App
- Click Mail
- Click Preferences
- Click Accounts
- Select your Gmail account
- And click the (-) remove button
- Now we will re-add your Gmail account
- Before that, let us make sure that IMAP access is enable. If not, you can do that easily. To enable IMAP in Gmail, login into your Gmail web client (gmail.com) and then click Settings:
- Click the Forwarding and POP/IMAP tab
- Select Enable IMAP (IMAP access section)
- And scroll down and click Save.
- Now again in Mail App, choose Mail
- Click Add Account
- Select Google, then click Continue
- Enter your email and click Next
- Enter your password and click Next
- And follow the instructions

If this does not work, try the “Add Other Account” option and add smpt/imap info manually:
Gmail Not Updating On Mac
- Incoming server: imap.gmail.com
- Outgoing server: smtp.gmail.com
3- Open Safari and go to https://accounts.google.com/b/0/DisplayUnlockCaptcha and then enter your username and password, then enter the letters (captcha) then try again.
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4-Please try the following:
- Quit Mail App.
- Open Keychain (Applications > Utilities or Spotlight Keychain)
- Search: google.oa
- Find the accounts that you are having trouble accessing, and delete Keychains
- Now go to https://accounts.google.com
- Sign in with your problematic account
- Click Security (left menu)
- Find the “Third-party apps with account access” section and click “manage third-party access”
- Click macOS and to revoke its access
- Then sign out (https://accounts.google.com)
- On your Mac, go to System Preferences > Internet accounts and re-authenticate your account
- And open your Mail and try again
5-Still having the problem? if so try this:
- Download and install Charles (a proxy app): https://www.charlesproxy.com/latest-release/download.do
- Authorize automatic proxy, when asked
- In Charles go to the Help menu and then choose SSL Proxying > Install Charles Root Certificate
- Keychain Access will open. Find the “Charles Proxy…” (you may type Charles to search).
- Double click on it.
- Expand the Trust section and set to “Always Trust”.
- Close the window, enter your password when you are asked.
- In Charles, choose SSL Proxying Settings (Proxy menu).
- Add a new location with Host: people.googleapis.com
- Go to the Tools menu and then choose Rewrite and click Add.
- Add a new location with Host: people.googleapis.com.
- Add a new action:
Type: Body
Where: Response
Replace Value: {“names”:[{“metadata”:{“primary”:true},”displayName”:”Your Name”}],”emailAddresses”:[{“value”:”your@email”}]}
- And now on your Mac, open System Settings and Internet Accounts and re-authorize your account.
- Now test to see if it is working, if your issue is resolved now, feel free to remove the Charles app.
See also: macOS Mojave Draining Your Mac Battery Life? Here Is How To Fix
Mail User Guide
Mac Mail App Not Working With Gmail Inbox
In the Mail app on your Mac, if you’re certain you’re not receiving messages, even after clicking the Get Mail button in the Mail toolbar, try these suggestions.
Check whether Mail is retrieving a large message or a message with large attachments. See View Mail activity.
Check if you’re using filters in the message list that are preventing expected messages from being shown.
Try sorting messages in the message list by Date or another attribute, or searching for messages, to verify if you received them.
See Add an email account to Outlook for instructions. Set up Exchange account access using Mac OS X 10.10 or later. If you're running Mac OS X version 10.10 or later, follow these steps to set up an Exchange email account: Open Mail, and then do one of the following: If you've never used Mail to set up an email account, the Welcome to Mail page. How to add email to mail app on mac computer. Add or remove email accounts in Mail on Mac. Use the Mail app to send, receive, and manage email for all of your email accounts in one location. Simply add the accounts—such as iCloud, Exchange, Google, school, work, or other—you want to use in Mail. Outgoing Mail Server: smtpout.secureserver.net; Click Done. Apple Mail verifies your Workspace Account settings and loads your email. Your email is on your Mac and you're good to go! If you want to add your email to another device, click Previous. If you're all set, head to the next step! If you have more than one Apple Mail account, click.
Check whether your account is offline or disabled (inactive).
If you’re missing emails from a specific person or group, check whether you blocked messages from them.
Try quitting Mail, then opening it again.
Choose Window > Connection Doctor, then follow any instructions in the Details column. Check for problems logging in to email accounts or with the incoming mail server, or with firewall software blocking network traffic.
Check whether you’re affected by another firewall, such as software installed separately from macOS or built into an internet sharing router, or administered by your email account provider. Contact the appropriate person for information.
If you’re still having problems, contact your email account provider to verify your user name, password, incoming mail server, and other required information. Then verify the information is entered correctly in Mail account preferences.
If you’re logged in to a network using VPN, also make sure that you entered your VPN password correctly.