Email won’t send from iCloud account.

Hi cmills0874,

Thanks for reaching out in Apple Support Communities. I understand you're unable to send an email from your iCloud account in the Mail app on your device and it's also preventing you from sending other messages. I also see that you've tried to delete the email that won't send, but you're unable to do so. I know how important it is to be able to send email from your device; I'd like to help. I'd recommend using the steps below:

"If you can't access your email, or you can't send and receive messages with your @icloud.com email address, follow these steps.

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

1. 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. 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. 

Get more help

If you still need help, contact iCloud Support."

Get help using iCloud Mail

Best Regards.