No whitelist yet for specific domains, but thanks so much for the awesome feedback. This feature ask is noted by our Enterprise team and they will consider it in a future roadmap plan.
As a friendly reminder: today you can turn off external communication outside your domain entirely (on/off) in the Glip Administration page. Just look for this Company Settings section, there are a few controls there for invites and sign ups -- based on your desired needs just select the controls you want on.
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