Do I need to update my MX record in order to migrate?
MigrationWiz uses the information you specify on your connector (ex: host name, URL, etc.) in conjunction with email addresses you specify to connect to source and destination mailboxes. We do not use MX record information in order to connect to source and destination mailboxes. The MX record for your domain may point to the source or destination system. MX record information controls where email gets delivered but we never use MX record information to login to the source, or the destination.