Re: [exim] AUTH FAIL not fatal error?

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Author: John Jetmore
To: Frank.Elsner
CC: exim-users
Subject: Re: [exim] AUTH FAIL not fatal error?
On Tue, Apr 24, 2012 at 3:07 PM, Frank Elsner <Frank.Elsner@???> wrote:
> Hi colleagues,
>                just curious:
> Why is this not a fatal error resulting in a non-delivery report:
> 2012-04-24 17:21:03 1SMhY5-0004Nn-Vg == xxxx@??? R=via_egypt T=smtp defer (-42): authentication required but authentication attempt(s) failed

Is it possible that the remote server returned 4xx codes in response
to the authentication requests? I'm imagining the difference between
the server saying "4xx, I can't talk to my back end user database
right now" and "5xx, That's not a valid username/password combo"