Check email address lambda

[frankolson]

Is your feature request related to a problem? Please describe.
We should not be storing or processing emails for emails that no longer, or never did, exist. Eventually or SES service will need to define a rule for accepting emails. This ticket is for creating the lambda function that that rule will use.

Describe the solution you'd like
A lambda function that:

• takes a string (the email address being checked) as an input and checks whether or not there is a matching unexpired inbox
• returns a boolean value base on that check
  • true ~> matching inbox
  • false ~> no matching inbox, or the matching inbox is expired