The alternativeEmail field is now validated against the active email domain to ensure that users do not erroneously set an email address on that domain as the alternative email address.
Additional mailboxes are subjected to an availability check to ensure that the new mailbox names are not already taken.
A new endpoint is added/consumed to check availabilities for new mailboxes ( works with D59619-code )
Testing instructions
Add Email to a domain
Attempt to add an alternate email with the same domain as the owning, active domain.
You should see an error similar to the following …
Ensure that you already have existing mailboxes on the domain
Attempt to add an additional existing mailbox
You should see an error similar to the following …
Unfortunately, no screenshots were provided by the developer.
