Mail messages (body) not showing up

Hey there corbinbdc,

Thank you for using the Apple Support Communities! We understand at times the body of your email message is not appearing right away. We'd like to see how we can help.

To start we've got a few questions to gather more information about this.

-What type of email account is affected in the Mail app? Gmail, Outlook, Yahoo, etc.

-Do the affected email messages include any attachments, or are they text only?

-Are the affected email messages in your Inbox, or a different folder?

-Had you previously moved these messages from the Inbox to a folder created under On My Mac?

We'd also like to have you test your internet connection with this behavior. In other words, test to see if this behavior happens while you're connected to Wi-Fi or Ethernet.

We look forward to hearing back from you.

Regards.

corbinbdc,

Thanks for letting us know rebuilding the mailbox seems to correct the problem.

Since it sounds like that step only works temporarily, as you'll notice the issue again some time after, we can continue to assist. It will be important for you to take a look at our initial reply and include responses to the questions there, too. Your responses will help us determine how to move forward with this behavior. Please also be sure to test your internet connection to isolate further.

We look forward to your responses.

Thank you.