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Most ISPs will let you smarthost out via their upstream mail server.

• icebraining 15y ago
  Oh, right, I tried that too, they said they've discontinued that service years ago.
  • nupark2 15y ago
    If you ISP provides SMTP for their e-mail (almost all do), then barring outbound From address filters, you can set up your SMTP server to treat the customer facing mail server as a smarthost. The ISP doesn't need to do anything specific to support it.
    • icebraining 15y ago
      I was absolutely sure they did filter, but I've just tested and apparently they don't. Well, that's unexpected. I might switch to self-hosting again then.
• bwarp 15y ago
  This is what I do. My ISP has a relay which I send all non local email from postfix to. I have a static IP address.