From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Mon Aug 02 2004 - 15:07:51 CDT

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On Mon, Aug 02, 2004 at 09:13:42PM +0200, Magnus B?ck wrote:

> On Monday, August 02, 2004 at 21:04 CEST,
> rs112972 <rs112972via-rs.com.br> wrote:
>
> > My name is Leal, and i have a little problem with postfix and mysql
> > authentication...
> > When the mysql sever is busy, or "down"... and postfix can not
> > contact it, the mail is "lost" (user unknown).
>
> No, that is not the case. If Postfix cannot connect to a database, it
> says "temporary lookup failure" and returns a temporary error code (4xx)
> to the connecting client (which will retry later).
>
> This is completely unrelated to authentication.
>

The only exception to the above is when mysql is used for system
user accounts via the nsswitch. In that case the C-library getpwnam()
interface on many systems does not expose the temporary problem to
the application (Postfix). If this is the case complain to the OS
vendor. That is not a Postfix problem.

--
        Viktor.

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