Email on my iPhone doesn’t sync with my other Apple devices ? Why?

Hello LindaandLarry,

We would like to see how we can help you with your Mail app not syncing as expected between devices. It sounds like they may have been setup as a POP account instead of an IMAP account. Check out this link to confirm they are set up as IMAP accounts to sync across devices: Add an email account to your iPhone, iPad, or iPod touch - Apple Support

"Enter account settings manually 

If Mail can't find your email settings, then you need to enter them manually. Tap Next, then follow these steps:

1. Choose IMAP or POP for your new account. If you aren’t sure which one to choose, contact your email provider.
2. Enter the information for Incoming Mail Server and Outgoing Mail Server. Then tap Next. If you don't have this information, try to look it up.
3. 
4. 
   
5. If your email settings are correct, tap Save to finish. If the email settings are incorrect, you'll be asked to edit them. "

Cheers!