iOS 18 mail won’t download yahoo mail in background until I open the Inbox

Same issue here. Used to work fine before IOS18 upgrade. Other email accounts (Gmail, outlook, iCloud) working fine. I tried to delete and add back the account, change settings from Fetch to Manual and vice versa, to no avail.

I also tried deleting the account and adding it "manually" (i.e. without adding it as a Yahoo account, but rather specifying IMAP server settings, but the result is the same...

Having the same issue on my iPhone 15 Pro Max and my iPad. Ever since the iOS and iPadOS 18 updates my Yahoo! mails no longer download in the background. I have the same settings as I had with the previous iOS version, but I can only get my emails if I open the mail app. All other accounts work fine, but Yahoo! does not. When will this be addressed?

There is actually a setting for this particular behavior. If your fetch settings are set to “automatic”, it will only download over WiFi and when connected to power. The issue is that if your fetch settings are set to 15, 30, or 60 minutes, it functions as though you’re doing a manual fetch.

I tried many of the fixes in this thread and the one that worked for me was plugging in my phone. I had deleted my Yahoo account, and re-added it. My inbox was empty, but as soon as I plugged into power it downloaded my entire Inbox. Definitely a bug on Apple's part here as it continually is "Connecting", knows how many unread emails are in the account, but never actually downloads them.

Can you send us a screenshot of Apple confirming? Want to make sure before I raise this issue also it indeed will be addressed because it’s affecting me personally bad. I’m having to constantly go and try and refresh it to make sure I’m not missing important emails on my Yahoo. And yes I have it on 15min fetch.

After updating to iOS 18.1, it appears to have gone back to normal. I can see emails in the Mail app (updates still occurring every 15 as per settings). If I refresh the page, new emails will be downloaded correctly as pre-iOS18 behaviour.

I looks like Apple might have changed the inner workings of Mail on the mobile devices. You don't have your email download in the background now but only after you initiate the procedure by opening Mail and having the software query the servers. I believe that they did this to conserve the battery to last longer. If anyone has any information to the contrary I would appreciate it if you would update this thread.

Note to test this you can see the phone will Check for mail when plugging in and out power.