[Mimedefang] Trailing dots in hostname lookups

[Kenneth Porter]

On 2/2/2024 3:59 PM, Kevin A. McGrail via MIMEDefang wrote:
> Hi Kenneth, are your 4 search domains local lookups likely to be very 
> quick that havee high availability?  Otherwise they could add a lot of 
> delays so I do think it's worth more research.
>
> Can you post some of the log lines from maillog verbatim?  It might 
> trigger a thought. 

Alas, by the time I got to revisit this, my named query logs had rotated 
off the problem point. Obviously I need to increase the retention on 
those. It's possible that the entries I saw were from me testing the 
domain lookup from the command line, where I wouldn't have included the 
trailing dot. I don't see any other examples in my logs. It's also 
possible that the bounce I saw was from a transient error at mimecast 
caused by a misconfigured DNS load balancer that omitted the trailing 
dot. (This isn't the first time this happened, but it's rare.) I'll keep 
an eye on it.