May I send Confidential Information in unencrypted email?

Barring a higher level of confidentiality, you may transmit Confidential Information (Levels 2 and 3) via email provided that you exercise a high level of care to ensure that the message reaches only your intended recipients.  If you do so, it is strongly recommended that it be sent only to Harvard-affiliated email addresses (i.e. do not forward to personal Gmail accounts).