[fetchmail]fetchmail ETRN different domains

I have local.net and out.net. Out.net is queued by my ISP. I wish to fetchmail 
from
out.net all the mail using ETRN script 
(poll mail.isp with proto ETRN
localdoains out.net

but with result
:fetchmail:ETRN<251 Ok, no message for node ms.local.net,
that is logical because I worked with two differnet domains. Is there some 
trick to
masquerade domains, or is better to work with the same domain 

Thanks Danilo M