We've had to scale pretty quickly and have brought onboard outsourced contractors for support.<p>Right now we've just used their personal email accounts for invitations to Slack, Zendesk etc.<p>It's showing some pretty serious limitations. Hard to make services like Zendesk not spew data to email no matter how many settings you frob, etc.<p>We'd like to have email accounts that we manage for the contractors, but we don't really want them to be able to send email from our domain.<p>How does your company handle this? Dedicated subdomain for contractors? Completely separate Google Apps domain for contractors? Something else I'm missing? Thanks!