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> > <email@example.com>
> > (reason: 550 5.7.1 <firstname.lastname@example.org>... Relaying denied)
> That looks more like a major screwup ... maybe you should find a more
> reliable ISP.
This is where having a public archive of the bounce messages would help. Both
to exert pressure on the list admins to run this better AND to out subscribers
that have defective mail servers. It cuts both ways.