Incoming emails not appearing in Apple Mail or iCloud webmail

Incoming emails missing from Apple Mail and iCloud

If emails are missing from both Apple Mail and iCloud webmail, it’s unlikely to be simply a problem with the Mail app. 

The priority is to establish whether the messages are reaching iCloud at all.

The fact that the sender confirms the emails were sent, but receives no bounce notification, doesn’t necessarily mean they were delivered successfully.

What to check first

1. Search iCloud Mail thoroughly

Sign in at iCloud.com/mail and search for the sender’s address and the subject of a missing message. Check Junk, Archive and any custom folders, as well as Inbox and Trash.

Also check Mail settings for rules that might move, delete or forward messages. Confirm that forwarding is configured correctly, if enabled, and that your iCloud storage isn’t full.

2. Establish whether the problem is sender-specific

If messages from other people arrive normally, ask the affected sender whether their emails reach other iCloud recipients. The sender’s email provider, domain reputation or email authentication configuration could be relevant, although none of these can be assumed to be the cause.

3. Run a controlled delivery test

Ask the sender to send a plain-text message with a distinctive subject, noting the exact time sent. If it doesn’t arrive, ask their email provider or administrator to check the delivery logs.

The key question is whether iCloud’s receiving server accepted the message:

• If it was rejected or never reached iCloud: the sender’s email provider should investigate.

• If iCloud accepted it: contact Apple Support and provide the sending address, recipient address, subject, time sent and any available delivery-log details.

A missing bounce notification does not settle the question either way.

4. Check for wider service issues

Check Apple System Status for iCloud Mail problems. A normal status report doesn’t rule out an account-specific or message-specific delivery issue. Apple’s iCloud Mail troubleshooting guide is also worth consulting.

Should you switch email clients?

Not yet. Since the messages are missing from iCloud webmail too, changing from Apple Mail to another client is unlikely to help if the messages never reached the mailbox. A different client is worth considering only if there is evidence that messages are present on the server but Apple Mail fails to display or synchronise them.

The most useful next step is to trace one missing message through the sender’s delivery logs. That should help distinguish a sender-side problem from an iCloud delivery issue far more effectively than reinstalling Mail or changing clients.

One question would help narrow things down: are the missing emails sent to an @icloud.com address, and do messages from other senders still arrive normally?

Thanks for this comprehensive reply, which really helped me focus.

Actually, all of my test messages have now arrived, but very late after posting this, and in batches!

So I'm not 100% sure but I think the problem and delay was sender-specific and must have been caused by them using some sort of queuing system? It is an email service that I've only recently signed up to so maybe they're checking outbound traffic in some way?

I also viewed the raw source headers – not sure what I was looking for but it looks like part of the delay at least was caused by slow despatch.

I was quick to blame Apple because I have been getting other problems too which have made me very dissatisfied with Mail i.e. their ridiculous non-adjustable spam settings which have resulted in important legitimate messages arriving in the spam folder – but days late; and Mail constantly generating duplicate Bins that keep causing deleted items to reappear!

Websites and servers around the world are in a bit of a muddle due to potential problems with PHP or TLS certs. It might just be the case that the sending server might have been temporarily down due to the owner checking or patching. Normally there'd be a notification, but life's been hectic for IT support over the past few days.

Keep an eye on things, but it sounds like you're OK now.