Merge tag 'v0.52' of https://github.com/mail-in-a-box/mailinabox

v0.52 (January 31, 2021)
------------------------

Software updates:

* Upgraded Roundcube to version 1.4.10.
* Upgraded zpush to 2.6.1.

Mail:

* Incoming emails with SPF/DKIM/DMARC failures now get a higher spam score, and these messages are more likely to appear in the junk folder, since they are often spam/phishing.
* Fixed the MTA-STS policy file's line endings.

Control panel:

* A new Download button in the control panel's External DNS page can be used to download the required DNS records in zonefile format.
* Fixed the problem when the control panel would report DNS entries as Not Set by increasing a bind query limit.
* Fixed a control panel startup bug on some systems.
* Improved an error message on a DNS lookup timeout.
* A typo was fixed.

DNS:

* The TTL for NS records has been increased to 1 day to comply with some registrar requirements.

System:

* Nextcloud's photos, dashboard, and activity apps are disabled since we only support contacts and calendar.

# Conflicts:
#	setup/bootstrap.sh

conf/mta-sts.txt

@@ -1,4 +1,4 @@
-version: STSv1
-mode: MODE
-mx: PRIMARY_HOSTNAME
-max_age: 604800
+version: STSv1
+mode: MODE
+mx: PRIMARY_HOSTNAME
+max_age: 604800