"SafetyAnswer" works through a special e-mail address that used when sending and receiving e-mails.
This special e-mail address is the "Known address".
There are two types of "Known address": one that uses the e-mail address provided by "SafetyAnswer" (integrated type), and one that uses the e-mail address managed by the user (linked type).
Both are functionally equivalent to each other, but because of the easy of configuration and ease of management and operation, "SafetyAnswer" recommends an "integrated type" that provides a "Known address" as the standard usage form.
Since the email address is managed by "SafetyAnswer", the "integrated type" also supports changing the address name.
In the case of "linkage type", it is necessary to prepare an email address in advance, and since emails are sent and received through linkage with "SafetyAnswer", it is necessary to use it on the assumption that easily affected by the Internet communication.