If I change my MX records, will I still be able to perform subsequent passes?
MigrationWiz uses the information you specify on your Project (host name, URL, etc.), in conjunction with email addresses or other credentials, to connect to Source and Destination items. We do not use MX record information in order to connect to Source and Destination items. 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 log in to the Source, or the Destination.
Only incorrectly changing A records may affect the URL or host name you specify on your Project. If you need to update A records in DNS, note that we accept URLs and host names in IP format.