Concept resource program: Only business end users can buy message source programs. Only one message resource prepare might be ordered for each Alibaba Cloud account. Be aware: Produce a file underneath /and so on/apt/sources.checklist.d, not the /and so forth/apt/resources.record file exactly where the distribution's Formal repository addresses are located. https://fernandotcgbx.ttblogs.com/6278325/the-basic-principles-of-postal-smtp-setup