Yahoo email not working in mail app with iOS 11

I would like to share with everyone my solution to this problem, as I had been experiencing the exact same issue for the last few months. I have read through this entire thread and through everyone's comments. The following steps are guranteed to fix your problem:

1) Delete your current yahoo mail account on your iphone

settings

• accounts & passwords
  • yahoo
    • delete account

2) Sign into your yahoo mail account from any computer (mail.yahoo.com)

Once signed in, go up to the top right corner and place the mouse icon over your name (in between the settings and the home icons,) and a window will pop up. Click on 'Account Info.'

• On the top left corner, click the 'Account Security' icon
  • At the top, if you have your Yahoo Account Key enabled, YOU MUST DISABLE THE YAHOO ACCOUNT KEY
    • After disabling the Account Key, you will see multiple previously hidden options open up on the Account Security page. At the very bottom of the page, enable the option that says 'Allow Apps That Use Less Secure Sign In.' (Leave this page up, as you will need to come back to it for the last step)

3) Create a new yahoo mail account on your phone

settings

• accounts & passwords
  • add account
    • yahoo (follow the step by step instructions)

4) Your yahoo mail should now be working normally through your apple mail app on your iphone, however I would send a test email to yourself just to make sure

5) Finally, go back to your computer to the Yahoo Account Security page that you previously left open, and this time, DISABLE the option that says 'Allow Apps That Use Less Secure Sign In.'

If done correctly, these steps will fix the problem, while not compromising your security. The biggest issue is the Yahoo Account Key.

Most efficient solution is to delete the account and re-add it with the appropriate settings. This is after making sure the Yahoo servers are working properly first:

Remove your email account and set it up again

1. On your computer, sign in to your email provider’s website. Make sure that all of your email is there or make sure that your email is saved somewhere other than your iOS device.
2. On your iOS device, go to Settings > Accounts & Passwords.
3. Tap the email account that you want to remove.
4. Tap Delete Account.

Add your account again.

**TO ENSURE ALL IS DONE CORRECTLY, FOLLOW THE STEPS WITHIN THE FOLLOWING LINK:

https://support.apple.com/en-us/HT201419

i just had this problem with a new iPhone X. i tried deleting the Yahoo account and reloading, but all that would do is get the current email, then never update the inbox again. The solution was to disable fetch, and set it to manual: settings>Accounts & Passwords>Fetch New Data>Yahoo>Manual

With this change, the inbox only updates the Yahoo mail when I open the Mail app, but at least it works.

I had a lot of problems with Gmail on my Mac some time ago and, after searching forums for the answer, found that I needed to turn off "store drafts on server." After I did that it was fine. You might try checking that out. In addition there are some issues with two-factor authentication with Gmail that you might need to resolve.

And as I mentioned above, I think there is an issue with security between Apple Mail and Yahoo. Here's the message I received from Yahoo on my "recovery" email for my wife's Yahoo account after I deleted her Yahoo account and then tried to set it up "manually on her iPhone:"

"Your account is currently not enabled to sign in from apps that do not meet modern security standards (ex. Older versions of mail and calendar apps such as Outlook). As a result, we prevented a sign in to your Yahoo account.

We strongly recommend that you switch to Yahoo's apps such as Yahoo Mail on desktop and mobile and remove your account from all other less secure apps.

If you still want to use an app that uses less secure sign in, go to https://login.yahoo.com/account/security#other-apps and turn on "Allow apps that use less secure sign in". This is not recommended and may leave your account more vulnerable to compromise. To learn more, please visit our help page: https://help.yahoo.com/kb/SLN27791.html."

That is exactly what I said dude. Delete your yahoo mail account (in the apple app) on your iphone.

You are mistaken that Yahoo requires an account key to be set up for the apple app. I had an account key previously that was active, and could not access the option that says 'Allow Apps That Use Less Secure Sign In,' so I had to delete my account key in order to disable that option. Like I said, I just added my yahoo account back through the Apple Mail app on my iphone, AFTER DELETING MY YAHOO ACCOUNT KEY, and not only did it let me, but everything works fine and I can get my yahoo mail on my apple mail app now without any problems.

I spent a long time reading through this thread and everyone's comments, and actually took a few hours to research this problem through trial and error, until I isolated the issue and found an acceptable solution that works. I took additional time to share my results with everyone on this thread, since so many people were having the same issue, so I would appreciate it if you wouldn't mislead other people and discount my post with invalid information when you haven't done the proper research; otherwise you would know that what I posted is true and works.

Alright I think I figured out how to fix this issue.

You have to login to your Yahoo account from a browser then select your name, Account Info and Account Security.

You should see a "manage app passwords". Add iPhone mail and follow the prompts.

I had to remove and recreate the yahoo mail account but at the end it worked.

The reason for this is that now Yahoo has tighten their security requirements and wants you to have more secure passwords. By following the above steps you are basically performing a two-step authentication and using a random password to access your account from your iPhone.

Hope this helps someone.

After trying many things and nothing working I find out yahoo up their secruity big time. This is how I was able to fix my issue and hope it works for you.

1: delete account off iPhone

2: restart phone

3: log in to yahoo account through browser.

4: select allow apps with low secruity under your Yahoo settings on the website.

5: create an account key by following the instructions. You will be asked to download the Yahoo App from the App Store. Download it once your done u can delete it.

6: once u have created and verified you can add your account to you iPhone through your phone settings like you normally would have.

7: once u add it your account key will pop up verifying it’s you adding this account to your iPhone. You select yes and boom your done! It’s working for me so far and I’m on IOS 11.2.5 on an iPhone 6s Plus.

I had this issue with one yahoo account while the others worked fine. Deleting and reinstalling it didn’t help. I changed it’s fetch new data setting from fetch to manual and scrolled to the bottom to the oldest emails and scrolled back to the top and it updated.

My other yahoos fetch settings that we’re set at manual never had a problem.

Per the yahoo support page you need to do the opposite of what is being recommended by @oasisg9.

Yahoo recommendation is delete Account in Apple App and add it back.

Yahoo actually now requires Account Key to be setup for Apple App. If you delete your yahoo Acct and try to add it back in Apple app - it would force you to setup Account Key. I have done this now lets see how it works.

Earlier I did not have Account Key neither for Apple App or my Ymail account itself - it did not work. So lets see now.

My husband had the problem on his iphone 6 as well and was very frustrated; it started before the iOS update. He deleted and re-uploaded Yahoo, and it also updated the iOS to 11. Still no inbox updating. Today I asked him to check his spam file after reading some of the other comments. It was indeed populated. When he went back to his inbox it updated!

I find that if you log into yahoo mail through a browser, all missing emails start to appear on the iPhone. Once you log out and try to let the iPhone go solo, it's just a matter of days until you notice that you're not getting email anymore. And the vicious cycle starts again.

I am on the lated 11.2.5 on my iPhone 7 and the problem is still there

• Inbox does not update even if I pull it down to refresh. last emails show from Sunday, today is tuesday and I can see from a browser I have a bunch of emails since then.
• If I kill the mail app nothing happens
• If I turn of/on my iPhone nothing happens
• If I switch wifi offnothing happens
• If I switch mobile off nothing happens
• If I switch to airplane mode and back nothing happens

The only way to make it works is to either Hard shut down the phone (holding power and vol down) or removing the account and adding it again.

Also downloading the Yahoo mail app fixes it but I don't want to use that.

Although the solution is not ideal, today I solved the "no Yahoo mail since November 2017" problem with my wife's iPhone 6 / iOS 11.2.2. Here's what I did:

I dragged the Apple iOS Mail icon out of the bottom "tray" of the home screen and then dragged the Yahoo Mail app into the "tray." My wife now has a functional Yahoo mail app nestled between the Safari icon and the Messages icon. And the iOS Mail app now sits as a useless drone on the home screen among the lesser apps like Home, Weather, Stocks, etc. and will remain there until Apple or Yahoo fix the problem.

By the way, based on responses I got from Yahoo when trying to delete and then re-setup the Yahoo account, I suspect the problem has something to do with Yahoo mail interpreting Apple's iOS Mail app as an insecure, ie, not a "modern" app.

Experiencing this issues as well! Started about a week ago for me.

Using an alternative app or deleting/re-adding my account in iOS settings have been the only steps that have worked for me. Hoping for a permanent fix soon!

I dont think it's a Yahoo issue as I have the same issue with my Gmail account. iCloud and Outlook both work fine but Yahoo and Gmail dont. The mails from them seem to come through along with an iCloud or Outlook mail. When they're pushed through it seems to force the phone to poll all accounts and drags the others with it.