there are typically different levels of errors and where they should be 
sent in syslog.conf.

On 8/17/14, 7:25 PM, gregrwm wrote:
> tho it works most of the time, it seems an outgoing relayhost which
> requires auth fairly commonly causes returned mail (reason: 530 5.7.0
> Authentication required).
>
> can anyone clue me on tweaking sendmail to keep messages in the queue
> that would otherwise return the above error?  i'm surprised they
> aren't already being retried, retrying later is certainly done for
> other circumstances..
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