Can't add email accounts to Apple Mail

In reference to the Outlook account, I was having the same issue, not being able to add it to the Mail app in my MacBook Pro.

In my iPhone X, it worked fine.

After trying various solutions, I managed to add to the Mail.

When entering the initial information , such as email and password , I used the password created in the < AppPassword> .

Probably, because I had the two factor authentication enabled....

Give it a try!

This just happened to me, but I got it back! I deleted said account (one of my gmail accounts) from apple Mail. But it wouldn't let me add a new account. I clicked on the google link in accounts and just signed into my account that way. Lo and Behold it popped into my mail and my mail was back! Hope this helps anyone else.

That's a really odd dialog, which is to say I've never seen it before.

Please determine if the same problems occur in "Safe Mode": Use safe mode to isolate issues with your Mac - Apple Support.

See this article Network connection failure accessing Yahoo Mail on mobile devices | Yahoo Help …

IMAP server settings for Yahoo Mail | Yahoo Help - SLN4075

Same here. It's ridiculous. One day, my Mac just stopped receiving my gmail. I get it thankfully, on my iPhone.

so. what is the deal. I deleted the account, and now it will not let me add it back. I go through the steps, click DONE and it does NOTHING.

I updated to High Sierra and all my outlook accounts stopped running. In desperation, I deleted them and when I went in to add them, I get to the screen where you have to select the options you want to sync (Mail, Contacts, Reminders, Notes) and when I click NEXT, the wheel spins briefly and then nothing happens. I cannot find a solution to this and have no idea what is going on.

This is exactly what mine has done - last Friday. One of the Gmail accounts in mail is still working fine but my main Gmail won't connect. I removed it and now can't add it as above? Tried changing the password but no progress.

I was on to Apple Support for an hour last night and they only told me to do everything I had already done. I've gone through safe start up and no issues reported. This is now driving me mad!

I have a similar issue. I use Apple Mail on an iMac, MacBook Pro and iPhone. I have several mail accounts that work fine on all three. However, I have a few accounts with an organization that I belong to. I have been able to add all of them to my MacBook but my iMac rejects all of them. I have a couple on my iPhone but just tried to add a new one and it asked for a Username under Incoming Mail Server (though not under Outgoing...). I don't know of a Username, and didn't need it when I added this account a few minutes ago to my MacBook Pro.

Created a SiteGround email account. Tried to add the account to my HighSierra (10.13.1) desktop Mail app (thru System Preferences) without success. (Was able to add it to my Thunderbird app, tho.) Tried to add the account to my iPhone (iOS 11.4.1) and was successful. On the desktop, System Preferences > Internet Accounts claims that the email address and password are invalid. If iOS accepted that combo, why not MacOS?

I have a similar issue with former Gmail accounts IMAP'ed to Apple Mail. I was changing passwords for these accounts, formerly a simple issue, when a pop-up window informed me that "Google requires authentication via Safari." What? Why? I almost never use Safari, preferring Chrome, so what is this roundabout? Very crazy.

I have a similar issue with former Gmail accounts IMAP'ed to Apple Mail. I was changing passwords for these accounts, formerly a simple issue, when a pop-up window informed me that "Google requires authentication via Safari." What? Why? I almost never use Safari, preferring Chrome, so what is this roundabout? Very crazy.

They've really messed it up trying to make it foolproof for those "automatic" types that Mail offers to try to setup.

There's something that needs deleting about Mail, but not sure if it's in Containers, Caches, Preferences, or all of them. :(

the same happen to me, I stopped getting email in one of my gmail accounts and did everything I've found and nothing works.

so I deleted the gmail account and now can't add it back on.

every time I try I get this message. "Authentication Failed" Failed to authenticate with Google, please try again later.

so I try again later and get the same message. this is so frustrating!!!

it's just a bit frustrating, when I try to add my account I get the google pop up and opens safari, then it says that it failed.

then I go to the gmail account and check mail and open the security email they sent and I click that it's ok to allow and add my gmail email address but the same thing happens over and over.

this just sucks!!