Hi Jennifer,

Are you using High Sierra Apple Mail?
 IMAP or POP Account?
Are all the Mailboxes created in ‘On My Mac’? 

Have you tried - Control-click a message, choose Move To, then choose a mailbox?

Cheers,
Ronni

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 23 Jul 2018, at 10:28 am, Jennifer Lefroy <lefroy.jenni...@gmail.com> 
> wrote:
> 
> Good Morning, 
> I have created a new mailbox, but when I drag an email from the inbox to it, 
> it disappears.  I can drag emails successfully to other created mailboxes.
> 
> I would be grateful for help.
> 
> Regards, 
> 
> Jennifer
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