Apple Watch 7 E-mail problem: content of an email does not load until I read the email on iPhone

Hi mchos01,

For help with reading messages from the Mail app on your Apple Watch, test changing the preview settings with steps below found in the article here: Manage mail on Apple Watch - Apple Support

"Choose which mailboxes appear on Apple Watch

1. Open the Apple Watch app on your iPhone.
2. Tap My Watch, then go to Mail > Include Mail.
3. Tap the accounts you want to see on your Apple Watch under Accounts. You can specify multiple accounts—for example, iCloud and the account you use at work.
4. If you want, tap an account, then tap specific mailboxes to see their contents on your Apple Watch.

By default you see messages from all inboxes. You can also choose to view messages from VIPs, flagged messages, unread messages, and more.

You can also choose the accounts and mailboxes you see, right on Apple Watch. Open the Mail app, scroll down, tap Edit, then tap an account or mailbox."

Additionally, in the Mail settings page you can change the "Message Preview" to view additional lines of text. The image in the article shared above has a great visual.

If the issue continues unpair, and pair back your Apple Watch to test: Unpair and erase your Apple Watch - Apple Support

Cheers.