[Exim] error 501

pls cc: me to jybarbier@??? (not subscribed)
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Hi list,

To be able to send mails, I *must* identify through my #§@!& ISP
DNS.
As I don't wan't to use its DNS as forwarders, is there a manner
to tell exim to use these, only for sendind mail?

thanks in advance,

Jean-Yves