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Go to Profile > (Non-Default) Project Mapping > Domain Rules and press New Domain mapping
This will then open the configuration for the Domain Rule. Here you define the Email Domain Rule and who to match against and then you press save.
Once the configuration is entered and saved you will be able to see the configuration within the Domain Rule summary.
Configuration Options
Email Domain Rules
A CSV list of Regular expressions that is used to match against the Sender or the Addressee (CatchEmail).
Catch email to match (Mailbox/sender)
This allows you to define who you would like to match against. Current options are:
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