Mailbox unavailable. The server response was: 5.7.1 Unable to relay for [email protected] [closed]

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Aahh got it… I got it working 🙂

Thanks Christopher, your suggesion is correct.

But, finding “Default SMTP Virtual Server” was tricky 😉

Even if you use IIS7 to deploy your web site, you have to open IIS6 Manager to configure SMTP server (why?).

I configured SMTP server as follows to make things work:

  1. Open IIS6 Manager using Control Panel –> Administrative Tools.
  2. Open SMTP Virtual Server properties.
  3. On General tab, Set IP address of
    the Web server instead of “All
    Unassigned”.
  4. In Access tab, click on Relay
    button, this will open Relay
    Restrictions dialog.
  5. In relay computers list, add the
    loopback IP address i.e 127.0.0.1
    and IP address of the Web server, so that they can pass/relay emails through the SMTP server.

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