On Tue, 2009-07-21 at 07:01 -0400, Sam Varshavchik wrote:
> Brian Seklecki writes:
> 
> > It could be a broken SMTP client (Possibly something made by Dell) 
> > 
> > It could also be a Courier instance with mis-configured DSNs or double
> > bounces per this msg:
> 

It turned out to be a broken Postfix install.  Go figure (sic). 

Courier's bounce detection was being undermined by a HA-deployment: A
Round-robin A record.

  "There's got to be a better way.", right?

~BAS

> It's a triple bounce.
> 
> > The tricky part is that that some of my internal forwarding-only Courier
> > relays aren't delivering this locally -- they appear to be attempting to
> > deliver remotely:
> 
> Then don't forward the postmaster mailbox to a remote address.




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