Doubt on vanity Email Setup 'Configure vanity Email'

Summary:

in the last part of the Instructions given in https://docs.oracle.com/en/cloud/saas/talent-management/22b/faimh/enable-vanity-email.html#s20080475 there is a section for 'Configure vanity Email'.

What exactly does it do ?

And what are the consequences of not following that step.

And anyone who managers the Domain Email, Should be able to do the needful as given in the instructions ?

We did try this in our test instance and it works perfectly fine (We get the test emails with teh Display name and email ID we mentioned) without us doing the last part of the configuration that i mentioned above.