From: Magnus Bäck (magnusdsek.lth.se)
Date: Sun Jul 02 2006 - 14:01:55 CDT

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On Sunday, July 02, 2006 at 20:35 CEST,
     Chris McKeever <techjedigmail.com> wrote:

> On 7/2/06, Magnus Bäck <magnusdsek.lth.se> wrote:
>
> > But you don't want bounces. Bounces are bad. You want rejections. It
> > is true that virtual alias rewriting is performed recursively -- but
> > the recipient validation made by smtpd(8) is NOT recursive. If a
> > lookup returns a result, the address it valid. This means that your
> > Postfix will accept any address with a dot in it, e.g.
> > blah.blahexample.com, and later bounce the invalid recipient
> > bblahexample.com.
>
> if I sent to no.onesemailexample.com I get:
> Final-Recipient: rfc822; nonesemailexample.com
> Original-Recipient: rfc822; no.onesemailexample.com
> Action: failed
> Status: 5.0.0
> Diagnostic-Code: X-Postfix; unknown user: "nonesemailexample.com"

What server produces this bounce? Without that information the
above bounce message snippet is utterly and completely useless.

Never show bounce messages. Always show logs from your server.

[...]

--
Magnus Bäck
magnusdsek.lth.se

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