From: Wietse Venema (wietseporcupine.org)
Date: Tue Apr 29 2008 - 19:37:01 CDT

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Since people keep asking for this, I implemented the following
user interface.

        Wietse

Incompatibility with snapshot 20080428
======================================

Postfix SMTP server replies for address verification have changed.
unverified_recipient_reject_code and unverified_sender_reject_code
now handle "5XX" rejects only. The "4XX" rejects are now controlled
with unverified_sender_defer_code and unverified_recipient_defer_code.

Major changes with snapshot 20080428
====================================

Finer control over the way that Postfix reports address verification
failures are reported to remote SMTP clients.

- unverified_sender/recipient_defer_code: the numerical Postfix
  SMTP server reply code when address verification failed due
  to some temporary error.

- unverified_sender/recipient_reject_reason: fixed text that Postfix
  will send to the remote SMTP client, instead of sending actual
  address verification details.

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