While I don't have hundreds of domains using ip mapping I do have thousands
of users mapped to 3 different individual domains. That is a left over from
our move from sendmail to qmail and merging all the old mail servers into
one. All the new client domains are setup to use full user @ domain, but
it's not really an option for the 3 main domains (Our original ISP, plus 2
other ISP's that we bought out).

It's not really an option not to use ip mapping.



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