IOS mail app with view headers?

"@lbutlr" <kremels-/[email protected]>
Newsgroups gmane.comp.macosx.general
Message-ID <[email protected]> 
Sometimes I need to be able to check the headers of an email, but this is not possible in iOS mail.

Does anyone know of a decent slim email client for iOS that does this and doesn't require my creating an account with a third party?

(What I am doing now is using roundcube, but that is less than ideal)

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