Why do I get This message has not been downloaded from the server?

[iMore Question]

This message has not been downloaded from the server

After a while this is what I am receiving on my 5s but it has already showed me the attachment earlier it just goes away

 

[Just_Me_D]

Re: This message has not been downloaded from the server

Are you using the native Mail app or a 3rd-party Mail app? Are you seeing the possible "preview" of the email via the Notification center or lock screen alert?