There are domain configurations for workflows/bulk/campaigns, etc. but even if there's a dedicated domain for general workflows, if a Send Document/Contract action is used, it overrides the domain configuration settings.

It would be ideal if we could also choose what domain documents can be sent in, or in any case, for the workflow dedicated domain to be respected when sending Documents out of a workflow action. This would potentially help with domains reputation, in case there's a general email dedicated domain and it gets flagged as spam.