Cannot send message using the server iCloud (iCloud)

I had the same problem but today is 2017-11-04 and I am running macOS 10.13 (High Sierra) on a 2017 MacBook Pro 15".

I tried the two top suggestions in this string with no luck. I previously have deleted my iCloud account all together and reconnected it, with no luck.

To fix I just disabled the iCloud mail account by going to System Preferences > Internet Accounts > "iCloud" and unchecking the mail from the list. I waited a few minutes and from the mail.app preferences pane I chose the Accounts tab and picked my iCloud account from the list on the left then I clicked the "Enable this account" checkbox.

NOW IT WORKS!

Go figure... Ugh!

Hi Keanu, I am having exactly the same problem despite the iCloud system status saying all services are working. In my case connection doctor indicates all is well.

Believe it not I think I just solved my similar problem. It seems a scary fix but it does work. Before you try my listed fix open Mail and make sure you have all your email from your Inbox saved locally on your Mac. So nothing should be listed in the Inbox. After you have moved everything from the Inbox then precede with my possible fix.

1. In Mail open Mail's Preferences and write down all the email server settings (to paper or a text file) because in the next step they will be blown away.

2. While still in Mail Preferences highlight the iCloud Account. In the Outgoing Mail Server(SMTP) use the edit function and use the - symbol to delete ALL SMTP server accounts (don't worry OS X will recreate this automatically). Once all SMTP account are delete proceed to step three.

3. After step 2, delete all the Accounts out of Mail then QUIT Mail!

4. Next open up System Preferences->iCloud (Make sure you are singed in and REMEMBER the name/password you used to sign in) and (once signed in) put a checkmark 'Mail & Notes". Then go back into the main System Preferences pane and select "Mail &Accounts". In that pane also put a checkmark in "Mail & Notes".

5. Open Mail and Mail's Menu items select 'Window", 'Connection Doctor' and make sure you get all Green dots on iCloud. If you get all Green dot by iCloud click on the red connection doctor menu bar to close it. Then open Mail's Preferences-Accounts and push the + button to add your other email servers information back in.

After these steps you shoud open Mail's Preferences again and tweak the email keeping sent messaages for days, weeks, etc. Just do mess with the SMTP server settings again. Hopefully this fix will work for your problem because it just worked for me. Good luck.

I have the same problem. What I did to fix it (temporary) was to add alternative smtp servers both in Mail.app and on my iPhone.

p01-smtp.mail.me.com

p03-smtp.mail.me.com

p04-smtp.mail.me.com

Those work for me. I gues it depends on where you are. But the issue remains and I both send and receive messages very slowly.

I have the same problem also on my Ios devices.... :(

Keanu, I tried this solution too, but it says the server is offline. I have discovered that I can send email from my @me.com account if I log on to iCloud.com in Safari and send the email from there. Still doesn't address the actual problem with the mail app of course. 😟

I'm having the same problem with server p05. Very frustrated. I can recieve mail in OS X Mail from my @me account but can't send any from within the Mail app. The iCloud web app works for sending and recieving.

Hi Fabio, I found this post which gives a great working solution for iOS devices. Unfortunately it can't be used in the same way on desktop.

Solution for send and receive email in OIS device

I've not been able to send and email via Outlook. I changed my SMTP server to both the P01 and P02 and both reject my password that successfully logs me into icloud.com.

So I changed my smtp back to the smtp.me.com one and it immediately sent all my pending mail.

***???

there's a service outage affecting icloud email for ios devices

https://discussions.apple.com/thread/3393293?tstart=0

Thanks for letting us know. I'm getting a call from Apple Support at 5:15PM to find out what is going on too. The status page still says that all the servers are working fine but I'm not seeing any improvement since Tuesday!

I can understand rollout problems for a new service but at least factually report whether or not the system is having problems so those of us don't waste hours trying to troubleshoot our own systems!

It looks as if Apple have solved the problem. All mail is working as expected with the normal settings on all devices including mail app on my mac mini. At last! (I also hope the fix lasts longer than last time 🙂)