Email [from Direct communication using APA 6th ed.]
Emails are not considered recoverable data. Therefore, you do not give details in your reference list. You should, however, cite an email within the body of your text as a personal communication.
An email on the web is recoverable (published) using the web address (or URL) and should be referenced as a webpage
Citation in Text
... indicated a clear preference for private schools (J. Smith, personal communication, July 15, 2004)