It isn't possible to block this based on a domain at a board level, but with Business Class you can limit invites to your Workspace based on the domain. You can see more information about this here.
Once you've done that, you can also limit board invites so that only Workspace members can be invited to boards.
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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