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18 May 2015 RecommendedIt's true that Sage ERP X3 has some number of add ons that you can take advantage to streamline emailing your documents to your customers, such as Sage ERP X3 EDD, EDM, PIA, but in standard Sage ERP X3, a workflow can be setup to email a single document like a Sales order invoice to a customer in an automatic way, by following below steps. (Screen shots are from V7)
Conclusion: You can use the power of workflows to email a single document to a customer.