there is email of application admin - " app-admin@email.com"

and custom email - " custom-email@mail-xyz.com"

how to make sending using internal "sendmail" of zoho creator so that

1) from address will be " custom-email@mail-xyz.com"

2) emails from zoho creator's email service will be not in spam because of SPF and DKIM settings of mail-xyz.com email service