Postfix stable release 3.1.0

[An on-line version of this announcement will be available at
http://www.postfix.org/announcements/postfix-3.1.0.html]

Postfix stable release 3.1.0 is available. This release ends support
for legacy release Postfix 2.9.

The main changes in no particular order are:

  * "postfix tls" command to simplify setup of opportunistic TLS,
    and to simplify SMTP server key/certificate management.

  * Positive and negative DNS reply TTL support in postscreen(8).

  * SASL AUTH rate limit in the Postfix SMTP server.

  * A safety limit on the number of address verify requests.

  * JSON-format Postfix queue listing.

  * Destination-independent delivery rate delay

For details, see the RELEASE_NOTES file.

You can find the updated Postfix source code at the mirrors listed
at http://www.postfix.org/.