icloud mail sync

Hello and welcome to Apple Support Communities, Douglas!

I understand that when you delete an email on your Mac, the change does not sync on your iPad. I'd be happy to provide information on how to troubleshoot this.

Try restarting your iPad and see if the changes sync: Restart your iPad

If the issue continues, use these steps: Get help using iCloud Mail

"If you need help sending or receiving mail on your iPhone, iPad, or iPod touch

1. Make sure that you're connected to the Internet. Try to open apple.com in Safari on your iPhone, iPad, or iPod touch.
2. Go to iCloud.com on a Mac or PC to see if you can receive email for your iCloud email.
3. Tap Settings > [your name] > iCloud and turn on Mail on your iPhone, iPad, or iPod touch. If you're using iOS 10.2 or earlier, go to Settings > iCloud.
4. Make sure that new data is pushed to your device automatically. Tap Settings > Passwords & Accounts > Fetch New Data, and turn on Push. Then send an email to your account to see if Push is working.

• • On your device with iOS 10, tap Settings > Mail > Accounts > Fetch New Data, and turn on Push.
  • On your device with iOS 9 and earlier, tap Settings > Mail, Contacts, and Calendars > Fetch New Data, and turn on Push.

1. Go back to Fetch New Data. Then Tap your iCloud account and turn on Push. If you have multiple iCloud Mail accounts, you can use Push with one account at a time. Make sure that Push is turned on for your primary iCloud Mail account.
2. Turn your device off and back on.

If you still can't send or receive mail, turn off each of the settings in steps 3, 4, and 5 above, then turn them back on."

The steps above might help the email sync.

Have a great day!