Blaise Hurtlin wrote:
May I should explain a bit more what i want to do..

I'm migrating my mail system from an old, buggy, Groupwise system to Postfix. The migration will take several month as I can't migrate all users at the same time. I want the following behaviour: all migrated users use the Postfix to send mails. On Postfix, if the user does not exist (ie, the mailbox is still on the Groupwise system), so i want to configure Postif to send the mail to Groupwise if he does not know the user.



- define the domain as a relay domain (put it in relay_domains, not elsewehere)

- if you can, dump the list of valid recipients and use it to populate relay_recipient_maps

- if you can't, use reject_unverified_recipient at the end of your smtpd restrictions. This assumes that tour groupwie validates recipients.

- in any case, start gathering the list of valid recipients.

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