Chicago Style Guide 17th Edition: Email communication
Unpublished interviews and personal communications are cited only as footnotes.
Footnote: #. First Name Last name, Description, Month Day, Year.
2. Mike Forrester, e-mail message to author, January 20, 2011.
In-Text Citation: Use a superscript number (like this: ¹) in the text at the place where you are indicating that you are citing from a source.
Mike Forrester in a private email told me that badger-fighting was common in Tipperary in his own childhood in the forties.²
Note: Unpublished interviews and personal communications are cited only as notes.
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