Melvyn Sopacua: > The problem is that postfix will see "success" initially: > > - client sends > - postfix receives > - postfix relays, gets OK > ----> postfix deletes queued message > - exchange checks quota, decides mailbox is full > - exchange sends DSN to client
Use reject_unverified_recipient, with a persistent database. This will check the Exchange response BEFORE accepting mail, and will avoid hammering the Exchange server with repeated requests. http://www.postfix.org/ADDRESS_VERIFICATION_README.html Wietse
