iCloud Mail not syncing across devices

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.

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’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.

I've just encountered this problem in the last few days as well.

I receive/read emails on four devices: iPad, iPhone, MacBook Pro, and a Mac desktop. I'm using PostBox, a third-party email client, on the desktop and Apple Mail on the other three devices. Each are displaying different numbers of read/unread messages.

Sometimes/often, when I select a message to read, it doesn't display. Instead, I get the spinning busy icon. It can take up to several minutes for a message to display. Messages I delete on one device are still shown as unread on the others, including the web version of iCloud mail.

I've talked with Apple service and they've not been able to help so far. I've reinstalled MacOs - the latest version - and the problem persists.

I would appreciate any helpful guidance.

thanks

I have the same issue. I was always able to read, delete or move emails on of my three devices and it was mirrored on all the others. Now I'm having to go through the emails on my phone, iPad and Mac to keep it organized. Signed out of apple ID on all devices and logged back on and it did NOT fix the problem on any of them.

Called apple support and the first guy totally got the issue, had me try some stuff that people here have already listed and that I had already tried. No dice. He bumped me up to a second tier ‘engineer’ who insisted on fixing a problem I did not have. He could not focus on what I was saying the issue was. He knew exactly what I was ‘trying’ to say and I could not get him to budge from his assumption. After an hour and a half on the phone I had other things to do and just said ‘Thanks, you were a huge help’ and hung up. Email accounts are still not syncing across devices. More frustrated than before because now I know that no one has an answer. I get dozens of emails a day and having to delete and sort them on each device is time consuming. I may delete the accounts on all but one device and only use that one device to handle email. Most inconvenient. My issue only started about three weeks ago, not like others in this thread who have had the issue for a year or more.

Quick update: in the last couple of days my problem appears to have cleared up. The iCloud messages are now syncing across devices and the message bodies load immediately when I select an email message. The messages are behaving as expected in my third-party desktop email client PostBox as well.

The thing is though, I did nothing to make this happen. I haven't made any changes to any settings in Mail on any device or to PostBox on my desktop. It just started working again and so far it is working fine.

I'll update if things take a turn for the worse again.

Same. After a fruitless call to tech support last week, suddenly all of my mail accounts are syncing across my devices. Also, the emails are loading much quicker than they had been. Thanks, Apple for fixing the problem??

You are lucky!! I have had to re-establish my account through Outlook so many times. I even went directly to Mail in iCloud and it takes forever to even delete mail and it does not update on my other devices. Someone at Apple must be complaining about this!! You would think??

Well, the problem still exists for me. I don't use iCloud mail at all; only an email account from

Spectrum that I've had since around 2005. The same problem as others have described began yesterday. Everything was syncing fine up until yesterday afternoon. Now, if I delete messages on my iPhone the changes don't sync across to my MacBook Pro. Likewise, anything I do from the MacBook Pro doesn't sync to my iPhone. I have the last update for Mohave on my MacBook Pro and iOS 14.4 on my IPhone 12 Pro Max. Yes, I'm always hesitant to do upgrades on either device. I've had nightmare senarios on previous upgrades. I wanted to delete my email account on my iPhone but it I get a prompt: all IMAP notes will be deleted from this iPhone so I don't want to do that and lose all my notes because I have over 1000. I haven't signed out of iCloud as suggested either because it hasn't worked for others. I'm slightly technically challenged so any help is appreciated.