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-rw-r--r--mail/postfix-current/files/pkg-message.in16
1 files changed, 16 insertions, 0 deletions
diff --git a/mail/postfix-current/files/pkg-message.in b/mail/postfix-current/files/pkg-message.in
index 23becb903391..737a9f367698 100644
--- a/mail/postfix-current/files/pkg-message.in
+++ b/mail/postfix-current/files/pkg-message.in
@@ -31,6 +31,22 @@ EOM
If you are upgrading from prior postfix version, please see the README
files for recommended changes to your configuration and additional
http://www.postfix.org/COMPATIBILITY_README.html
+
+Incompatible change with snapshot 20200920
+==========================================
+Internal protocols have changed. You need to "postfix stop" before
+updating, or before backing out to an earlier release, otherwise
+long-running daemons (pickup, qmgr, verify, tlsproxy, postscreen)
+may fail to communicate with the rest of Postfix (warnings, timeouts).
+
+The purpose of this change is to produce better error messages, for
+example, when someone configures the discard daemon as a bounce
+service in master.cf, or vice versa.
+
+This change will break third-party code that implements a
+Postfix-internal protocol such as qpsmtpd. Programs that depend on
+Postfix internal details are not supported.
+
EOM
type: upgrade
}