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Some of the changes in XF 2.2.15 include:
Avoid setting duplicate List-Unsubscribe headers.
Include first post QA schema items unconditionally.
Make outdated PHP version notice in admin control panel clearer.
Retain the original unsubscribeEmailAddress option for backwards compatibility.
New unsubscribeEmailHandling option to replace the new unsubscribeEmail option and conclusively fix issues arising from yesterday's XF 2.2.14 release.
Fix URL unfurls no longer unfurling.
Current requirements
Please note that XenForo 2.2 has higher system requirements than earlier versions.
The following are minimum requirements:
PHP 7.0 or newer (PHP 8.2 recommended)
MySQL 5.5 and newer (Also compatible with MariaDB/Percona etc.)
All of the official add-ons require XenForo 2.2.
Enhanced Search requires at least Elasticsearch 2.0.
Code:
https://xenforo.com/community/forums/announcements
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