Ask HN: How do you handle contractor email addresses?

We've had to scale pretty quickly and have brought onboard outsourced contractors for support.

Right now we've just used their personal email accounts for invitations to Slack, Zendesk etc.

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.

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.

How does your company handle this? Dedicated subdomain for contractors? Completely separate Google Apps domain for contractors? Something else I'm missing? Thanks!