You'll get an email if you've been accepted, you'll sometimes get an email if you've been rejected. No real way to know if it's been seen, as far as I know.
If a client respond to your proposal, a message room will be created and the proposal will be moved to the Active Candidacies section of your Proposals page. Depending on your notification settings, a notification email will be sent regarding the clients response to your proposal.
In case your proposal is rejected it will move to the Archived tab on the Proposals page. Users aren't notified whether their proposal has been seen.
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