Incompatibility with snapshot 20190615
====================================

The Postfix TLS library by default no longer waits after sending a
TLS 'close' notification. This should be safe with TLSv1.2 and
later. Specify "tls_fast_shutdown_enable = no" to enable historical
Postfix behavior.

Major changes with snapshot 20190615
====================================

After sending a TLS 'close' notification, the Postfix library by
default no longer waits for the TLS peer to respond. According to
RFC 2246 (TLSv1.2) section 7.2.1, "It is not required for the
initiator of the close to wait for the responding close_notify alert
before closing the read side of the connection."

The SMTP+LMTP delivery agent can now prepend Delivered-To, X-Original-To
and Return-Path headers, just like the pipe(8) delivery agent. This
uses the same "flags=DOR" command-line flags in master.cf. See the
smtp(8) manpage for details.

This obsoletes the "lmtp_assume_final = yes" setting, and replaces
it with "flags=...X...", for consistency with pipe(8).