Add DNS SPF upgrade notice; Extend Changelog items

docs/releases.rst

@@ -18,9 +18,13 @@ Here’s a short summary of new features:
 - Full-text-search is back after having been disabled for a while due to nasty bugs.
 - Tons of documentation improvements, especially geared towards new users.
 - (Experimental) support for different architectures, such as ARM.
-- Improvements around webmails, such as CardDAV and a new skin for an updated roundcube, and support for MySQL for it.
+- Improvements around webmails, such as CardDAV, GPG and a new skin for an updated roundcube, and support for MySQL for it. Updated Rainloop, too.
 - Improvements around relaying, such as AUTH LOGIN and non-standard port support.
 - Update to alpine:3.12 as baseimage for most containers.
+- Setup warns users about compose-IPv6 deployments which have caused open relays in the past.
+- Improved handling of upper-vs-lowercase aliases and user-addresses.
+- Improved rate-limiting system.
+- Support for SRS
 
 Upgrading
 `````````
@@ -38,6 +42,10 @@ Override location changes
 If you have regenerated the Docker compose and environment files, there are some changes to the configuration overrides.
 Override files are now mounted read-only into the containers. The Dovecot and Postfix overrides are moved in their own sub-directory. If there are local override files, they will need to be moved from ``overrides/`` to ``overrides/dovecot`` and ``overrides/postfix/``.
 
+Update your DNS SPF Records
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+It has become known that the SPF DNS records generated by the admin interface are not completely standard compliant anymore. Please check the DNS records for your domains and compare them to what the new admin-interface instructs you to use. In most cases, this should be a simple copy-paste operation for you ….
 
 
 Mailu 1.7 - 2019-08-22