Thanks for reaching out to the community!
Cause of your problem/feature: It's happening because in the Adobe campaign we have one OOTB typology rule to ensure that your email respects the format of all the recipients available in the target query. This particular typology rule, Deco-mail check, is started during the analysis and This typology rule is only executed if at least one of the recipients is configured to receive emails in Deco-mail (DoCoMo), Decore Mail (Softbank) or Decoration Mail (KDDI AU) format.
Ideally: You can create a workflow that contains two deliveries: one to be read on a Japanese mobile and another for recipients with a standard email format.
If this is something, you do not want you can disable this rule.
Read more here: Defining the content
Thanks for answer, but I still don’t understand how this functionality start?
Because in my recipient don’t have the user with this configure (Email Format = Deco-mail or Decore Mail or Decoration Mail). How show in the image below:
Do you know what's the problem? Is there another field I'm not analyzing?