Mermaid C4 Context Diagram with MAIDR

People and systems are read inside their boundaries, each relationship with what it does and its technology.

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C4Context
  title Internet banking
  Person(customer, "Customer", "A customer of the bank")
  Enterprise_Boundary(bank, "Bank") {
    System(banking, "Internet Banking", "Lets customers manage their accounts")
    SystemDb_Ext(mainframe, "Mainframe", "Stores the core banking data")
  }
  System_Ext(mail, "E-mail system")
  Rel(customer, banking, "Uses")
  Rel(banking, mainframe, "Reads accounts", "XML/HTTPS")
  Rel(banking, mail, "Sends e-mail", "SMTP")
  Rel(mail, customer, "Delivers e-mail")