A dynamic “do not send to” list, based on a list from another plugin?

[User]

This is more of a request or a query about what is possible.

We have WordPress programmers on hand, but before we start contemplating our own Frankenstein solution, I’d like to ask if anyone has had a similar problem to resolve.

Basically: We have a site with Newsletter + TEC + Registrations for TEC.

We use Newsletter to send invitations for events.

However, if a user is *already* signed up to an event, we’d like to exclude them from the recipient list.

The recipient list is “all users on the site” by default. Is there a way to build a *dynamic* exclusion list pulled from somewhere else?

[Author]

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