Relaying to SPF protected server

Hello people,

Iam trying to solv a problem with relaying. I want to setup a
distribution list for one domain, where will postfix only relay email
for mydomain.com to selected users email addresses. No local mailboxes,
only realaying list. Its quite simple, but.. but if I try to relay email
comming from SPF active (has active SPF in DNS) server and it is relayed
to SPF protected server (checking validity of sending server if SPF is
present in DNS for the sending domain), it is rejected, because of
course my server is not valid sending server for that domain.
Is there any solution?
I have idea to move senders address to "reply to" field and write new
sender. Is it possible with postfix?

Thanks

J.R.

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