问题 I want to email my customers using different "roles" (e.g. info@ , customer-support@, tech-support@, no-reply@). I've tried 2 approaches: Multiple "users"/accounts in my Gmail for business application. Single gmail account with multiple aliases. I started by setting up a Service Account with global delegation for my Gmail for Business application. To test that it works, I've set up 2 users: lev@mydomain.com and root@mydomain.com. Indeed, I can successfully send email both from lev@ and root@.