You can change text and customize message of Client Portal invitation Email. To do this go to Settings > Client Portal. (By default preset template will be in use)

In row with option "Deal shared with client" click on "EDIT" button to open editing dialog:

Type in message you would like to be sent and use "Insert value" option to use fields to personalize message and include different Client details where needed:

When done, press "Save" to apply:

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