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Make sure you don't have a local DNS zone file for their domain setup
or the server will use those settings instead of the authoritative DNS servers
for the domain and your zone files will superceed the real ones when sending
mail to the client's addresses from your own server irregardless of the
/etc/localdomains and /etc/remotedomains.
Personally, my experience with clients that insistent on using their own DNS,
my general consensus is well something that couldn't be said in public forum.
They generally come around or realize the hard way why that rule is in force
and in what few instances there have been over the years, come crawling back
again pretty quickly when they figure out the errors of their ways. Bottom line
is I wouldn't be that flexible but my first paragraph above will probably clue you
into the issue with this particular case.
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