iCloud Mail not syncing across devices

Right - this is similar to me keeping my MBP running without going into standby mode. As long as there is a device constantly pinging and managing, syncing seems to work. Why the **** the servers don't seem to manage this is beyond me.

I have the same issue, but it didn’t start till after the the iOS 14 update. I have an older iMac, an iPad Pro, and an iPhone 8. I logged out of iCloud and logged back in on all devices but the iPad is the one that never seems to catch up.

I had this exact problem on the new iPhone 12 Mini.

I was receiving email across all devices, but any changes made on the phone wouldn't reflect on the other devices, inc. laptop and iPad. (Changes made on other devices synced just fine - even on the iPhone.)

I tried EVERYTHING: signing in and out of iCloud (on all devices), deleting and reinstalling accounts, etc.

The solution was to DELETE THE MAIL APP ON MY IPHONE. I reinstalled it and suddenly everything worked fine, syncing between all devices. Hope this helps.

Rebuild got the mailbox in sync. But then it didnt' stay synced up afterwards. It was like the sync info gets to my MacBook but doesn't make it to the Mail program.

My issue is similar to many here, looking for clues before I poke around some more.

I have signed out of iCloud and still all Mail edits (mostly deleting and marking as 'read') made on my Mac do not show up on my iPhone. So on my Mac, I have reviewed all my mail and have no new mail yet my phone and my iPad say I have 572 emails that I haven't read.

I just started having the same issue a few days ago. I have three apple devices: MacBook pro, iPhone 8, and Ipad 7. When I delete messages from Apple Mail off my Mac, it doesn't sync with the other two devices. I primarily use Mail on my Mac but I'm forced to delete messages from my phone or iPad to get consistency across devices. I have two email accounts: gmail and apple. The problem is the same for both.

I have tried everything I found in the forms. I removed accounts and added them back. I have delete mail apps and reinstalled. I have singed out of and back into iCloud. Nothing seems to work.

Any suggestions?

In case it helps anyone figure this out, another issue that started at the same time...none of my apple mail rules run automatically anymore. They still work, but you have to run at least one manually to get them working. It's very strange.

Yes I was with Apple Support going these same procedures a couple of days ago. It seem like it worked but now is back by not updating. Also the lag time in refresh is at a crawl. Apple claims there is no server issues. I think the last OS updates must of killed something.

Apple’s mail program has fallen victim to spaghetti code. That is when you add too many features, mostly useless. The code is so complicated that even the Apple programmers can’t fix it. The Apple operating system gets slower everyday because of feature bloat. Their computers are becoming almost useless. Sad end to a great software company.

Forgot to mention ... yes, my four different devices do not sync mail in anyway. It’s beyond pathetic. And I’ve signed in and out several times. Latest OS, latest iOS, latest hardware. Doesn’t matter. Just expensive garbage. Lost faith in Apple.

There are a lot of Auto-updates throughout the Apple ecosystem. Is it possible to list all hardware device models, along with MacOS and iOS versions?

Sometimes looking at the list and doing simple internet searches reveals the solution...

In my opinion, Apple and the Community will help you find answers.

There’s is something deeply wrong with the iCloud Email Server!! It’s takes forever to delete email and any refresh on Safari!! This problem is tricked down to all devices that are signed in and synced to Mail! It has gotten worse and I am really surprised that Apple employees themselves have not complained about this!!

Are you requested, here is a list of my NON SYNCING hardware and software:

iMac (Retina 5K, 27-inch, Late 2014), MacOS Big Sur 11.2.3 (20D91)

iPhone 11 Pro, IOS 14.4.2

iPad Pro (11-inch) (2nd generation), IOS 14.4.2

MacBook Pro (15-inch, 2018), MacOS Big Sur 11.2.3 (20D91)

Thanks, should have asked whether all your devices were running latest OS and iOS, which apparently they are. I'm at a loss, but I will continue to research your topic and post relevant findings.

best of luck

This is so frustrating to read! I'm having this problem as well. Although mine may be the reverse of some others. If I read on my phone, it shows as read on my Mac. If I read on my Mac though, it does not show as read on my phone. I was not having this problem until I got a new phone just a couple of weeks ago. It worked fine for about a week and then started with this issue. I had this once before a few years ago but I can't remember how I resolved it. I keep trying the suggestions here but so far nothing has worked. Will keep searching for answers. I have the new iphone 12 mini. This is why I hate getting new phones and doing updates. But it was getting to where I couldn't even answer my old phone and needed a new one. Argh.