As standard, any new package that is created or migrated into 20i gets given our default DNS. This will ensure the site and all its services such as email will function at 20i.
If you want migrate a package into 20i that has custom DNS then you’ll need to add these records before pointing the nameservers to 20i. This will ensure a seamless transition from your previous host.
MX records are the most common custom DNS that may want to be kept following a migration, so you'll want to add these to 20i before switching the nameservers.
To add custom DNS you'll need to: