To look up the MX record for a domain:
  1. Navigate to www.mxtoolbox.com
  2. Enter the email domain.  This is everything to the right of the '@' symbol.  (for example:  j.doe@alumni.foundation.org or j.doe@example.com)
  3. Click the orange 'MX Lookup' button.
  4. See results.  These are these are the servers email will be delivered to for the domain entered in step 2.